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Salt Analysis(Qualitative Inorganic Chemistry)

1. Solubility & Colour of Compounds 2. Properties of Gases & Compounds Q 1. Which one has the minimum solubility product? Q 1. Zn and Hg metals can be distinguished by using (A) AgCl (B) AlCl3 (A) NaOH (B) HCl (C) BaCl2 (D) NH4Cl (C) Both A & B (D) None of these Q 2. Which of the following sulphate is insoluble in Q 2. Which Metal dissolve in both NH3 & NaOH ? water? (A) Zn (B) Fe (A) CuSO4 (B) CdSO4 (C) Al (D) Pb (C) PbSO4 (D) Bi2(SO4)3 Q 3. Bromine is recognized by its Q 3. Mark the compound which is soluble in Hot (A) Pungent smelling dark red vapours water? (B) Ability to turn FeSO4 solution black (A) Lead Chloride (B) Mercurous chloride (C) Ability to turn starch iodide paper blue (C) Stronsium Sulphate (D) Silver chloride (D) Ability to dissolve in CS2 to give an orange Q 4. Which of the following basic radical is most colour to the organic layer difficult to precipitate? Q 4. Hydrochloric acid gas can be identified by its 3+ 2+ 2+ + (A) Characteristic pungent smell. (A) Fe (B) Cu (C) Ba (D) NH4 (B) Reaction with ammonia to give white fumes Q 5. Which of the following is most soluble in water? of NH Cl. (A) AgCl (B) AgBr 4 (C) Reaction AgNO to give white precipitate (C) AgI (D) AgF 3 insoluble with in NH4OH. Q 6. PbCl2 dissolves in (D) Reaction with MnO2 to liberate Cl2 gas. (A) NH3 (B) H2O Q 5. When concentrated H2SO4 is added to dry KNO3, (C) Boiling H2O (D) None of these Q 7. Colour of Nickel chloride solution is brown fumes evolve. These brown fumes are of (A) Pink (B) Black (A) SO2 (B) SO3 (C) Colourless (D) Green (C) NO (D) NO2 Q 8. Which of the following is Coloured? Q 6. A gas X is passed through water to form saturated (A) PbCl2 (B) PbI2 solution. The aqueous solution on treatment with (C) AgCl (D) AgI silver Nitrate gives a white precipitate. The Q 9. Which of the following compound is red? saturate aquesous solution also dissolves (A) PbO (B) PbO2 Magnesium ribbon with evolution of a colourless (C) Pb3O4 (D) K2Cr2O7 gas Y. Identify X & Y [IIT JEE 2002] Q 10. Ni – compound are generally green (A) X = CO2, Y = Cl2 (B) X = Cl2 ,Y = CO2, (A) Blue (B) Green (C) X = Cl2 , Y = H2 (D) X = H2 , Y = Cl2 (C) Red (D) Brown Q 7. Which gas has a fishy smell & turns red litmus Q 11. Which of the following compound is Red? paper blue? (A) Ni(DMG)2 (B) Cu2[Fe(CN)6] (A) NH3 (B) PH3 (C) (NH4)2[Co(SCN)4] (D) Fe(SCN)3 (C) H2S (D) N2O Q 12. Mercurous ion is represented as Q 8. Which of the following gas has rotten fish smell? 2+ 2+ (A) NH3 (B) PH3 (A) Hg2 (B) Hg (C) CO2 (D) CO (C) Hg+ Hg 2+ (D) Hg + 2 Q 9. CO2 gas & SO2 gas are distinguished by using Q 13. Which of the following metal form compounds (A) NaOH (B) NH3 with pink colour? (C) K2Cr2O7 (D) HCl (A) Ni (B) Cr (C) Co (D) Fe3+ Q 10. Which of the following is called Tear gas? (A) CoCl2 (B) CCl3NO2 RISHI SIR [B.TECH. IIT KANPUR] www.atozchemistry.com 54 Be Topper with Topper in Chemistry in JEE Main & JEE-ADV Contact No. +91 9852476717

AtoZ CHEMISTRY Salt Analysis

(C) N2O (D) None of these Q 8. Which of the following can be detected by borax Q 11. A gas having pungent smell, absorbs in alkaline bead test? Pyrogallol solution is (A) Cu2+ (B) Zn2+ 3+ 3+ (A) CO2 (B) CO (C) Cr (D) Fe (C) O2 (D) N2 Q 9. The salt used for performing borax bead test in Q 12. NH3 & HCl gas can be distinguished by using qualitative inorganic analysis is (A) Litmus Paper (B) Base (A) K2SO4.Al2(SO4)3.24H2O (C) Acid (D) All of these (B) FeSO4.(NH4)2SO4.6H2O (C) NaNH4HPO4.4H2O (D) Na2B4O7.10H2O Q 10. In borax bead test, a colourless bead becomes coloured on being heated with a colourless metal 3. Flame Test, Borax Bead & Phosphate Bead test salt. It happens due to formation of Q 1. ZnO is white when cold & on heating, colour (A) the borate & meta borate of the metal become (B) Boric Acid (A) Red (B) Blue (C) Yellow (D) Black (C) the orthoborate of the Metal Q 2. Pb O is ………. in cold & is ……… in hot (D) the hexaborate of the metal 3 4 Q 11. Pick out the incorrect statement (A) Red, Blue (B) Red, Yellow 2− (C) Red, Chocolate (D) Red, Green (A) BO3 ion is triangular polar in which boron Q 3. Ferrous salt in hydrated form is …………..& in is sp3 hydridised -2 anhydrous form it is ………….. (B) Boric acid contains planar triangular BO3 (A) Green, white (B) Green, Blue units which are bonded together through (C) Red, Green (D) Blue, white hydrogen bonds into two dimensional sheets Q 4. The hottest region of Bunsen flame shown in the (C) Borozine is isoelectronic with benzene. In figure below is [JEE Main 2016] both compounds, the electrons are delocalised (D) The structure of boron nitride resembles that of diamond. For the given passage (i) A ⎯⎯→ Glassy Transparent Bead (B)

(B) + CuSO4 ⎯⎯→ Coloured Bead (C) ignite (ii) A + H2SO4 (conc.) + CH3CH2OH ⎯⎯⎯→

(A) Region 2 (B) Region 3 Green Flame (D) (C) Region 4 (D) Region 1 (iii) Aqueous Solution of A is Alkaline Q 5. The flame test is given by S block Metals due to Q 12. Identify A (A) Low Ionisation Energy (A) NaNH4HPO4.4H2O (B) Na2B4O7.10H2O (B) Low excitation energy (C) CuSO4.5H2O (D) None of these (C) High Ionisation energy Q 13. What is the formula of Glassy bead (B)? (D) High exciation energy (A) NaPO3 (B) NaBO2 Q 6. The colour of Ca in flame test is (C) NaBO2 + B2O3 (D) None of these (A) Brick Red (B) Crimson Red Q 14. Identify C (C) Lilac (D) Apple Green (A) Cu3(PO4)2 (B) CuSO4 Q 7. On occasion of marriage, the fireworks are used, (C) Cu(BO2)2 (D) None of these which of the following gives green flame? Q 15. Identify D (A) Ba (B) K (C) Be (D) Na (A) (CH3)3BO3 (B) (C2H5)3BO3 (C) H3BO3 (D) None of these

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AtoZ CHEMISTRY Salt Analysis

4. Bead Test, Cobalt Nitrate & Charcoal test 5. Class A(i) Anions Q 1. The Salt used for performing ‘bead test’ in Q 1. Class A(i) anions produces gas on action of qualitative inorganic analysis is (A) dilute HCl (B) Conc. HCl (A) K2SO4. Al2(SO4)3.24H2O (C) Doesn’t produce gas (D) on heating (B) FeSO4.(NH4)2SO4.6H2O Q 2. Which of the following is class A(ii) anions? − − (C) Na (NH4) HPO4.4H2O) (A) Cl (B) Br (D) CaSO .2H O − 4 2 (C) NO (D) All of these Q 2. In phosphate bead test, colour obtained by Cr is 3 (A) Blue (B) Green Q 3. Which salt would give SO2 with hot and dil. (C) Red (D) Yellow H2SO4 and also decolorizes Br2 water: Q 3. In Phosphate bead test, the bead formed is (A) Na2SO3 (B) NaHSO4 (C) Na2SO4 (D) Na2S (A) NaPO3 (B) P2O3 Q 4. An inorganic compound ‘A’ is dissolved in dilute (C) P2O5 (D) NaPO4 Q 4. Which of the following metals have violet bead hydrochloric acid and warmed. A gas ‘B’ is in phosphate bead test? produced. When a filter paper moistened with (A) Violet (B) Green potassium iodate and the starch solution is (C) Blue (D) Yellow exposed to the gas it turns blue. The gas B and Q 5. In cobalt Nitrate Test, the mixture is heated in the compound A are (A) Oxidising Flame (B) Reducing Flame (A) SO2 and Na2SO3 (B) SO3 and Na2SO4 (C) Neutral Flame (D) None of these (C) H2S and Na2S (D) H2S and Na2SO3 - - Q 6. In cobalt Nitrate test, the colour obtained by Al is Q 5. A mixture contains CI and I ions, which of the (A) white (B) Blue following tests exclusively confirm the presence (C) Green (D) Red of chloride ion? Q 7. In cobalt Nitrate test, which metal zincate has (A) Heating the mixture with Conc. H2SO4. pink colour? (B) Heating the mixture with K2Cr2O7 & H2SO4. (A) Ca (B) Sn (C) Mg (D) Zn (C) Add excess of AgNO3 solution to the Q 8. In charcoal cavity test, the metal gives neutralised sodium carbonate extract. Wash characteristics colour of the precipitate with dilute ammonia and add (A) Metal cobalt oxide (B) Metal Zincate dilute nitric acid to the washing. (C) Metal Oxide (D) Metal (D) Add excess lead acetate to the neutralised Q 9. Which metal has grayish white colour & doesn’t sodium carbonate extract. Boil the precipitate mark on paper? with water and cool (A) Pb (B) Sn (C) Cu (D) Ag Q 6. Which of the following halides is almost Q 10. Which of the following compounds sublimes on insoluble in concentrated ammonia? heating? (A) AgI (B) AgF (C) AgBr (D) AgCl (A) NH4Cl (B) Hg2Cl2 − (C) As2O3 (D) All of these Q 7. The brown ring test for NO3 is due to formation Q 11. In charcoal cavity test, cupric Red fragments are of the complex ion with formula 2+ 2– obtained by (A) [Fe(H2O)6] (B) [Fe[NO(CN)5] 2+ 2+ (A) Ag (B) Pb (C) Cu (D) Sn (C) [Fe(H2O)5NO] (D) [Fe(H2O)(NO)5] Q 8. On treatment with dilute HCl, gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The solution gives a yellow precipitate with potassium chromate. The salt is (A) NiSO4 (B) BaS2O3

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(C) PbS2O3 (D) CuSO4 6.Class A(i) & Class A(ii) Anions Q 9. A substance on treatmet with dilute H2SO4 Q 1. The species present in the solution when liberates a colourless gas which produces dissolved in water is (i) turbidity with Baryta water −−2 (A) COHCOHCOCO22333,,, (ii) turns acidified dichromate solution green 2− The reaction indicates the presence of (B) H2 CO 3, CO 3 2− 2− −−2 (A) CO23 (B) S (C) HCOHCOCO2333 ,, 2− − (C) SO3 (D) NO2 (D) C O223 H, C O

Q 10. A salt which gives CO2 with conc. H2SO4 & also Q 2. A violet colour is obtained on adding Cl2 water to decolourlised acidified KMnO4 on warming is a solution of Postassium Halide in presence of − 2− Chloroform and on adding excess of Cl2 water, (A) HCO3 (B) CO3 violet colour disappears and a colourless solution (C) oxalate ion (D) Acetate ion appears. This test shows the presence of Q 11. When conc. H SO is added to dry KNO , brown 2 4 3 (A) Iodide ion (B) Bromide ion fumes evolve. These brown fumes are of (C) Chloride ion (D) Iodide & Bromide ion (A) SO (B) SO 2 3 Q 3. Which of the following will not give positive (C) NO (D) NO 2 chromyl chloride test? Q 12. A salt gives violet vapours when treated with (A) Copper Chloride, CuCl conc. H SO , it contains 2 2 4 (B) Mercuric Chlroide, HgCl (A) Cl– (B) I– 2 (C) Zinc Chloride, ZnCl2 (C) Br– (D) NO− 3 (D) Anilinium Chlroide, C6H5NH3Cl Q 13. The acidic solution of a salt produced a deep blue Q 4. When a mixture of Solid NaCl, Solid K2Cr2O7 is colour with starch solution. The salt may be heate with conc. H2SO4, orange – red vapours are (A) Chlroide (B) Nitrite obtained. Vapours are of (C) Acetate (D) Iodide (A) Chromous chloride (B) Chromyl chloride (C) Chromic Chloride (D) Chromic Sulphate Q 14. [][]XHSOY+⎯⎯→24 , a colourless gas with Q 5. A gas is passed over NaOH gives yellow solution irritating smell which form yellow ppt. after passing on lead []XK++⎯⎯→ Cr OH SOGreenSolution 22724 acetate solution. The gas is [X] & [Y] are 2− (A) CrO2 (B) Cr27 O – (A) , SO2 (B) Cl , HCl 2− (C) CrO2Cl2 (D) CrO4 2– (C) S , HCl (D) , CO2 Q 6. A white sodium salt dissolves readily in water to Q 15. A sodium salt of an unknown anion when treated give a solution which is neutral to litmus. When with MgCl2 gives white precipitate only on silver Nitrate solution is added to the solution, a boiling. The anion is white precipitate is obtained which does not 2− (A) SO4 (B) dissolve in dilute HNO3. The anion could be – (C) (D) (A) (B) Cl (C) (D) S2– Q 7. On adding excess of KI solution to CuSO4 solution, we get a precipitate P and another liquor M. Select the correct pairs (A) P = Cu2I2, M = I2 solution (B) P = Cu2I2, M = KI3 solution (C) P = CuI2, M = I2 solution RISHI SIR [B.TECH. IIT KANPUR] www.atozchemistry.com 57 Be Topper with Topper in Chemistry in JEE Main & JEE-ADV Contact No. +91 9852476717

AtoZ CHEMISTRY Salt Analysis

(D) P = CuI2, M = KI3 solution 7. Class B Anions Q 8. When I2 is passed over KCl, KBr, KF Q 1. Which of the following on heating produces a gas (A) Cl2 & Br2 are evolved which generates laughing hysteria? (B) Cl2 is evolved (A) NH4NO2 (B) NH4NO3 (C) Cl2, F2 & Br2 are evolved (C) (NH4)2Cr2O7 (D) Pb(NO3)2 (D) None of these Q 2. Which of the following reaction is used to test Q 10. A metal salt solution gives yellow ppt with group B anions? postassium chromate in acetic acid, a white ppt (A) Precipitation Reaction (B) Redox Reaction with dilute sulphuric acid, but gives no ppt with (C) Acid – Base Reaction (D) Both A & B sodium chloride or iodide, it is: 2− Q 3. The SO4 ion gives yellow ppt with Hg(NO3)2. (A) Lead carbonate (B) Basic Lead carbonate The ppt is (C) Barium Nitrate (D) Strontium Nitrate (A) HgSO (B) HgSO .2H O Q 10. A metal salt solution gives yellow ppt with silver 4 4 2 (C) HgO (D) BaSO Nitrate. The ppt dissolves in dilute Nitric Acid as 4 Q 4. A compound produces deep blue colour with well as ammonium hydroxide. The solution H O , which is unstable. The compound contains contains 2 2 anions (A) Bromide (B) Iodide 2− 2− (C) Phosphate (D) Chromate (A) CrO4 (B) Cr27 O − 2− Q 11. When CuSO4 is treated with excess of KCN, the (C) MnO4 (D) SO23 product formed is Q 5. A solution gives white ppt with CaCl2 solution & 2– (A) [Cu(CN)4] the ppt dissolve in dilute H2SO4 and decolourises 2+ 3– (B) Cu get reduced to form [Cu(CN)4] acidic KMnO4 solution. The solution contains (C) Cu(CN) 2 (A) CO2− ion (B) CO2− ion (D) CuCN 24 3 − Q 12. A mixture on heating with conc. H2SO4 and (C) ion (D) CHCOO3 ion MnO2, liberates brown vapour of Q 6. Sodium Borates on reaction with conc. H2SO4 (A) Br2 (B) NO2 (C) HBr (D) I2 and C2H5OH gives a compound A which burns Q 13. Nitrate is confirmed by ring test. The brown colur with a green edged flame. Compound A is of the ring is due to formation of (A) H2B4O7 (B) (C2H5)2B4O7 (A) Ferrous Nitrite (B) Nitroso Ferrous Nitrate (C) H3BO3 (D) (C2H5)3BO3 (C) Ferrous Nitrate (D) FeSO4.NO2 Q 7. CrO3 dissolves in aqueous NaOH to give Q 14. A pale yellow crystalline solid insoluble in water (A) (B) but soluble in CS2 is allowed to react with nitric oxide to give X & Y. X is colourless gas with (C) Cr(OH)3 (D) Cr(OH)2 Pungent colour. X is further allowed to react in Q 8. (NH4)2Cr2O7 on heating gives a gas which is also aqueous medium with nitric oxide to yield Z & T. given by compound X, Z & T are (A) Heating NH4NO2 (B) Heating NH4NO3 (C) Mg3N2 + H2O (D) Na compound + H2O2 (A) SO3, H2SO3, N2O (B) SO2, H2SO4, N2O Q 9. Which of the following dissolve glass ? (C) SO2, H2SO4, N2 (D) SO3, H2SO3, N2 (A) HCl (B) HBr (C) HI (D) HF Q 10. Which anion gives yellow precipitate with ammonium molybedate? (A) Borates (B) Phosphate (C) Arsenate (D) Both B & C

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AtoZ CHEMISTRY Salt Analysis

8. Classification of cations Q 9. A mixture contains manganese (II) sulphide and Q 1. A Solution of the mixture was prepared in conc. cobalt sulphide. Dilute hydrochloric acid is HCl; on diluting this solution with water a added. Which of the following statements is turbidity appeared. This indicates the presence of correct? (A) As3+ (B) Sb3+ (A) Both are soluble in dil. HCI (C) Hg2+ (D) Bi3+ (B) Both are insoluble in dil. HCI Q 2. An aqueous solution of substance give a white (C)MnS in soluble in HCI while CoS in insoluble precipitate on treatment with dil. HCl, which (D) CoS is soluble in HCI while MnS in insoluble dissolves on heating when hydrogen sulphide is Q 10. Which of the following cations can be detected passed through the hot acidic solution, a black by passing H2S in acid medium? Precipitate is obtained. The substance is a (1) Cu2+ (2) Pb2+ 2+ 2+ (3) Bi2+ (4) Zn2+ (A) Hg2 Salt (B) Cu Salt (C) Ag+ salt (D) Pb2+ Salt Select the correct answer using the codes given Q 3. The best explanation for the solubility of MnS in below : dil. HCl is that (A) 1, 2, 3 and 4 (B) 1 and 2 (A) KSP of MnCl2 is less than that of MnS (C) 3 and 4 (D) 1, 2 and 3 (B) Conc. of Mn2+ is lowered by the formation of Q 11. Assertion (A) : In acidic medium Zn2+ is not complex ions with chloride ions precipitated by S2- ions. (C) Concentration of sulphide ions is lowered by Reason (R) : Common ion effect reduces the oxidation to free sulphur concentration of S2- to a minimum level. (D) Concentration of sulphide ions is lowered by (a) Both A and are true and R is the correct formation of the weak acid H2S explanation of A Q 4. Which of the cation(s) will(Shall) not be (b) Both A and R are true and R is not the correct precipitated by H2S is presence of ammonia? explanation of A (A) Co2+ (B) Mn2+ (c) A is true but R is false 2+ 3+ (C) Cd (D) Fe (d) A is false but R is true Q 5. The reagents NH4Cl and aqs NH3 will ppt. Q 12. The sulphides of which of the following groups 2+ 3+ (A) Ca (B) Al of elements are soluble in yellow ammonium 2+ 2+ (C) Mg (D) Zn sulphide? Q 6. A suspension contains ZnS, CdS, HgS, Ag2S and (A) As, Sb & Sn (B) As, Cd & Sn FeS. It is treated with 2N HCl and filtrate (C) Cd, Cu & Bi (D) Hg, Cu & Cd contains mostly Q 13. Which of the following pairs can not be separated (A) Zn and Hg ions (B) Ag and Fe ions by adding NH4Cl & NH4OH to the mixture? (C) Zn and Fe ions (D) Cu and Hg ions (A) Fe3+, Ca2+ (B) Cr3+, Fe3+ Q 7. The product/s got on passing H2S through a (C) Cr3+, Ba2+ (D) Al3+ , Mg2+ solution of is Q 14. Which one of the following can be used in place

(A) HgS (B) Hg2S + HgS of NH4Cl for the identification of the third group (C) HgS + Hg (D) Hg2S radicals? Q 8. If HCI is not added before passing H2S in the (A) NH4NO3 (B) (NH4)2SO4 second group, it may result in the (C) (NH4)2S (D) (NH4)2CO3 (A) incomplete precipitation of the II group Q 15. When H2S gas is passed through the HCl sulphide containing aqueous solution of CuCl2, HgCl2, (B) precipitation of sulphides of cations BiCl3 & CoCl2, it does not precipitate out belonging to subsequent groups (A) CuS (B) HgS (C) precipitation of sulphur (C) Bi2S3 (D) CoS (D) precipitation of lead as lead sulphide Q 16. Mark the correct statement

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(A) I group basic Radicals precipitate as chlorides Q 6. Of the following sulphides which one is insoluble (B) IV group basic radicals precipitates as in dilute acids but soluble in akalies. sulphides (A) PbS (B) CdS (C) V group basic radicals precipitates as (C) FeS (D) As2S3 carbonates Q 7. A pale green crystalline metal salt of M dissolves (D) All of the above statements are correct freely in water. On standing it gives a brown ppt on addition of aqueous NaOH. The metal salt solution also gives a black ppt on bubbling H2S in basic medium. An aqueous solution of the metal salt decolourises the pink colour of the 9. Group I, Group II & Group III cations permanganate solution. The metal in the metal Q 1. In the given reaction below, compound A & B salt solution is are (A) Coppper (B) Aluminium PbClKIAKCl+⎯⎯→+ [] 2 (C) Lead (D) Iron yellowppt. Q 8. A mixture of chloride of copper, cadmium, chromium, iron & Aluminium was dissolved in [A][] +⎯⎯→KIB water with acidified with HCl & Hydogen yellowppt.Excesssoluble sulphide gas was passed for sufficient time. It

(A) PbI4 & K2[PbI4] respectively was filtered, boiled & a few drops of Nitric Acid (B) K2[PbI4] & PbI4 respectively were added, while boiling to this solution (C) PbI2 & K2[PbI4] respectively ammonium chloride and sodium hydroxide were (D) PbI2 & K2[PbI2] respectively added in excess and filtered. The filterate shall Q 2. A salt on treatment with dilute HCl gives a give test for pungent smelling gas & a yellow precipitate. The (A) Sodium & Iron ion salt gives green flame when tested. The solution (B) Sodium, Chromium & Aluminum Ion gives a yellow ppt. with K2CrO4. The salt is (C) Aluminum & Iron Ion (A) NiSO4 (B) BaS2O3 (D) Sodium, Iron, Cadmium & Aluminum Ion (C) PbS2O3 (D) CuSO4 Q 9. Solution of chemical compound X reacts with Q 3. White substance dissolves in hot water. A black AgNO3 solution to form a white ppt. Y which precipitate appears on passing H2S gas in its dissolves in NH4OH to give a complex Z. When aqueous solution. The black precipitate dissolves Z is treated with dilute HNO3, Y reappers. The in hot HNO3. A white precipitate is obtained on chemical compound X is adding concentrated H2SO4 in its solution. This (A) NaCl (B) CH3Cl white precipitate is (C) NaBr (D) NaI (A) BaSO4 (B) SrSO4 Q 10. Which of the following compound on reaction (C) PbSO4 (D) CdSO4 with NaOH & Na2O2 gives yellow colour? Q 4. A metal salt solution forms a yellow precipitate (A) Cr(OH)3 (B) Zn(OH)2 with Potassium chromate in acetic acid, a white (C) Al(OH)3 (D) None of these precipitate with dilute H2SO4 but gives no Q 11. Which of the following gives blood red colour precipitate with NaCl or NaI. The salt is with KCNS? (A) Lead carbonate (B) Basic Lead Carbonate (A) Cu2+ (B) Fe3+ (C) Barium Carbonate (D) Strontium Carbonate (C) Al3+ (D) Zn2+ 2+ 2+ Q 5. Identify the correct order of solubility of Na2S, Q 12. Passing H2S gas into a mixture of Mn , Ni , CuS & ZnS in aqueous solution Cu2+ & Hg2+ ions in an acidified aqueous solution (A) CuS > ZnS > Na2S (B) ZnS > Na2S > CuS precipitates (C) Na2S > CuS > ZnS (D) Na2S > ZnS > CuS (A) CuS & HgS (B) MnS & CuS

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(C) MnS & NiS (D) NiS & HgS (A) MgCO3 is soluble in Na2CO3 Q 13. An anion present in solution gives a white (B) MgCO3 will also be precipitated in V group precipitate with MgSO4 only on heating and not (C) Na2CO3 is insoluble in water by mixing them in cold condition. The anion is (D) Na2CO3 will decrease the KSP of MCO3 2- - Q 9. Magnesium carbonate is not precipitated with the (A) CO3 (B) HCO3 2- 2- carbonates of group V radicals in presence of (C) SO3 (D) C2O4 NH4OH and NH4Cl because (A) MgCO3 is soluble in water (B) MgCO is soluble in NH OH 3 4 (C) MgCO3 is soluble in NH4Cl 10. Group IV & Group V cations (D) MgCO3 is soluble in(NH4)2CO3 2− Q 10. The reagents NH4Cl and aqs NH3 will ppt. Q 1. On addition of a solution containing CrO4 ions (A) Ca2+ (B) Al3+ to the solution of Ba2+, Sr2+ & Ca2+ ions, the first (C) Mg2+ (D) Zn2+ precipitate obtained will be Q 11. Magnesium gives a sky blue precipitate in (A) CaCrO (B) SrCrO 4 4 alkaline medium using the reagent (C) BaCrO (D) A mixture of all the three 4 (A) DMG (B) o-phenanthrolein Q 2. Nessler’s reagent is (C) p-nitrobenzene azo resorcinol (A) K HgI (B) K HgI + KOH 2 4 2 4 (D) cupferron (C) K HgI + KOH (D) K HgI + KI 2 2 2 4 Q 12. A scarlet coloured compound (I) on treatment Q 3. Nessler’s Reagent is used to detect with conc. HNO3 gives achocolate brown ppt (II) 2− 3− (A) CrO4 (B) PO4 and a filtrate. The filtrate on treatment with − + NaOH followed by KI gives a yellow ppt (III). (C) MnO4 (D) NH4 Q 4. Dimethyl Glyoxime in a suitable solvent was The compounds I, II and III are respectively refluxed for 10 minutes with pure pieces of nickel (A) HgI2, HgO and Hg2I2 sheet. It results as (B) Pb3O4, PbO2 and PbI2 (A) Red ppt. (B) Blue ppt. (C) K2Cr2O7, Cr2O3 and K2CrO4 (C) yellow ppt. (D) No ppt. (D) Co(NO3)2, CrO and CoI2 Q 5. Ferric ion forms a Prussian Blue coloured ppt of Q 13. NH4SCN can be used to test, one or more out of Fe+3, Co+2 and Cu+2 (A) K4[Fe(CN)6] (B) Fe4[Fe(CN)6]3 (A) Fe+3 only (B) Co+2 and Cu+2 (C) KMnO4 (D) Fe(OH)3 +3 +2 Q 6. Prussian Blue is formed when (C) Fe , Cu (D) all Q 14. Colourless salt (A) + dil. H SO + KI → Blue (A) Ferrous Sulphate reacts with FeCl3 2 4 colour. A can be (B) Ferric Sulphate reacts with K4[Fe(CN)6] (A) K2Cr2O7 (B) MnO2 (C) Ammonium sulphate reacts with FeCl3 (D) Ferrous Ammonium sulphate reacts with (C) NH4NO2 (D) NH4Cl Q 15. A light coloured crystalline solid A has 27.55% FeCl3 H2O. A gives the following reactions. Q 7. An aqueous solution of FeSO4. Al2(SO4)3 and BaCI 2 chrome alum is heated with excess of Na2O2 an (i) A ⎯⎯⎯→ white precipitate filtered. The materials obtained are insoluble in conc. HNO3 (A) A colour less filtrate and a green residue K3[ Fe ( CN )6] (B) A Yellow filtrate and a green residue (ii) A ⎯⎯⎯⎯⎯→ a dark-blue precipitate K24 HgI (C) A Yellow filtrate and a brown residue (iii) A ⎯⎯⎯⎯→ Brown precipitate (D) A green filtrate and brown residue Identify A. Q 8. The group reagent for V group residue is (A) Fe2(SO4)3 (NH4)2 SO4. 8H2O (NH4)2CO3; Na2CO3 cannot be used to precipitate (B) FeSO4 (NH4)2 SO4. 6H2O these radicals because

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(C) (NH4)2 FeSO4 . 6H2O Q 11. A greenish coloured group II solution gave a (D) FeSO4 (NH4)2 SO4 . 5H2O black precipitate with H2S which was extracted with (NH4)2S and the remaining solid was found to be soluble in 3M HNO3. The (NH4)2S extract produced an orange precipitate when acidified. 11. Identification of Cations The cations probably present are +2 +2 +2 +3 Q 1. Which of the following gives black ppt. with (A) Cu , Pb , Bi , Sb (B) Cu+2 and Sb+3 NH4OH? (C) Hg2+, Cu+2, Pb+2, Bi+2, Sb+2 (A) Ag2S (B) AgCl (D) Sn+2, Sb+3, As+3 (C) HgCl2 (D) Hg2Cl2 Q 2. Which of the following ion gives white ppt with Q 12. To a solution containing divalent metal cations A & B, K2CrO4 is added separately. When A gives SnCl2, which turn black? (A) Hg2+ (B) Cu2+ a chocolate coloured precipitate while B gave a (C) Sb3+ (D) Bi3+ yellow precipitate. A and B are (A) Cu+2, Pb+2 (B) Ag+, B+2 Q 3. With K4[Fe(CN)6], chocolate ppt is given by +2 +2, +2 +2 (A) Cu+ (B) Cu2+ (C) Zn , Cu (D) Pb , Cu (C) Hg+ (D) Ag+ Q 13. When metallic Cu is heated with conc. H2SO4, in addition to copper sulphate and sulphur dioxide, Q 4. Which of the following give white ppt with H2O? some is also formed. It is (A) BiCl3 (B) Hg2Cl2 (A) Copper oxide (B) copper sulphide (C) AgCl (D) SnCl2 Q 5. Which of the following gives blue colour with (C) sulphur (D) sulphur trioxide

NH4CNS? (A) Co2+ (B) Bi3+ (C) Ni2+ (D) Mn2+ Q 6. Which of the following gives pink ppt with NaOH, which turns black on heating? (A) Mn4+ (B) Cu2+ 12. Passage Type questions (C) Co2+ (D) Mn2+ Passage 1: Q 7. Ammonium salt with Nesseler’s reagent gives In second group analysis, the group reagent is brown ppt of H2S in presence of HCl. This is because of the high solubility product of the sulphides of subsequent (A) I–Hg–O–Hg–NH2 (B) I–Hg–NH2 group metals. The identification of the metals of (C) I–Hg–Hg–O–NH2 (D) None of these Q 8. Which of the following ions give white glatinous second group depends upon the factors like their precipitate with NaOH? Solubility in acids, alkali yellow ammonium + sulphide and their ability to form complexes and (A) NH (B) K+ 4 their relative stabilities. 2+ 2+ (C) Mg (D) Cu Q 1. In second group, precipitation of same sulphides Q 9. With aquaregia, which of the compounds give take place only of dilution of the acid. The white turbidity? sulphides that are precipitated only on dilution are (A) NiS (B) CoS (A) CdS andPbS (B) Sb2S3, Bi2S3 (C) CuS (D) All of these (C) SnS2 (D) SnS Q 10. Which of the following ions give apple green Q 2. In the separation of Cu and Cd, the addition of colour with KHCO3 in presence of Br2 + H2O? KCN is render (A) Co2+ (B) Ni2+ (A) copper as blue coloured Cu(CN)2 (C) Mn2+ (D) Zn2+ (B) copper as chocolate coloured Cu2 [Fe(CN)6] Precipitate

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(C) copper as stable colourless K3[Cu(CN)4] Passage 3: (D) copper as blue coloured K2[Cu(CN)4] 3. The colour of residues left in charcoal cavity test Q 3. Which of the following statements is not true of II and borax test inform about the cation present in group cations? the salt. The colour of the residue left behind on (A) HgS is insoluble in dilute HNO3 heating also helps in identification of the cation (B) Sodium stannite reduces BiCl3 to black Bi present. (C) Sb and Sn sulphides are insoluble, but As2S3 is Q 7. A substance on heating in a reducing flame in a soluble in HCl charcoal cavity gives a red brown residue in hot and (D) Sb2S3 is precipitated in presence of oxalic acid yellow residue in the cold. The cation present in the substance is Passage 2: (A) Fe3+ (B) Bi2+ (C) Pb2+ (D) Cd2+ In third group analysis, the cations are precipitated Q 8. Blue borax bead is obtained in oxidizing flame for as their hydroxide, the group reagent being NH4OH (A) Cu and Fe (B) Ni and Cu in presence of NH4Cl. Before proceeding to add (C) Mn and Co (D) Cu and Co the group reagents, the second group filtrate is Q 9. On heating Nickel salt the colour change that is boiled with conc. HNO3. noticed is Q 4. A statement that is not true regarding third group (A) Green to brown (B) green to yellow precipitation is (C) Blue to brown (D) green to white (A) (NH4)2SO4 cannot be used in place of NH4Cl along with NH4OH Passage 4. (B) NH4 NO3 can be used in place of NH4Cl along A chemist opened a cupboard to find four bottles with NH4OH containing water solutions, each of which had lost (C) NH4Cl must be added in excess before adding its label. Bottles 1, 2, 3 contained colourless NH4OH solutions, whilst Bottle 4 contained a blue solution. (D) NaOH dissolves only Al(OH)3 but Cr(OH)3 & The labels from the bottles were lying scattered on Fe(OH)3 are insoluble the floor of the cupboard. They were: Q 5. II group filtrate is boiled with conc. HNO3 before copper (II) sulphate adding NH4Cl & NH4OH because/in order to lead nitrate (A) solubility product of Fe(OH)2 is low compared hydrochloric acid

to that of Fe(OH)3 so that the solubility product sodium carbonate

of Fe(OH)2 can be easily exceeded at the low By mixing samples of the contents of the bottles, in concentration of OH- ions pairs, the chemist made the following observations : (B) solubility product of Fe(OH)2 is high compared Bottle 1 + Bottle 2 white precipitate to that of Fe(OH)3 so that the solubility product Bottle 1 + Bottle 3 white precipitate of Fe(OH)3 is easily exceeded. Bottle 1 + Bottle 4 white precipitate (C) oxidize Cr3+ to CrO 2- 4 Bottle 2 + Bottle 3 colourless gas evolved (D) oxidize Mn2+ to Mn3+ Bottle 2 + Bottle 4 no visible reaction Q 6. The use of bromine water and NaOH to 3rd group Bottle 3 + Bottle 4 blue precipitate precipitate Facilitates Answer the following Questions on the basis of (A) rendering Fe into Fe(OH) 2 above observations. (B) rendering Al into sodium metaaluminate Q 10. Bottle no. (1) contains (C) conversion of Cr into soluble sodium chromate (A) Pb(NO ) (B) HCl (D) elimination of III group cations completely 3 2 (C) Na CO (D) CuSO before precipitating IV group cations as their 2 3 4 sulphides.

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Q 11. Bottle no. (2) contains 13. Subjective Problems on Salt Analysis (A) Pb(NO3)2 (B) HCl Q 1. On treatment with cold water an element a reacts (C) Na2CO3 (D) CuSO4 quietly, liberating a colorless odorless gas B and a Q 12. Bottle no. (3) contains solution C. lithium reacted with B yielding a solid (A) Pb(NO3)2 (B) HCl product D which effervesced with water to give a (C) Na2CO3 (D) CuSO4 strongly basic solution E. when carbon dioxide was Q 13. Bottle no. (4) contains bubbled through solution C an initial white ppt. F was formed, but this dissolved forming solution G (A) Pb(NO3)2 (B) HCl when more CO is added. ppt. F effervesced when (C) Na CO (D) CuSO 2 2 3 4 moistened with concentrated hydrochloric acid and Q 14. Colourless gas evolved when contents of gives a deep red coloration to a Bunsen flame. Bottle (2) and Bottle (3) are mixed, will be Name the compound A to G. (A) O2 (B) CO2 Q 2. A colorless solid A on heating gives a white solid B (C) N2 (D) N2O and a colorless gas C. B gives off reddish brown fumes on treatment with dilute acids. Also when B Passage 5: is heated with NH4Cl, a colorless gas D and a p-Amino-N,N-dimethylaniline is added to a residue E are obtained. When A is heated with strongly acidic solution of X. The resulting solution (NH4)2SO4, a colorless gas F is obtained along with is treated with a few drops of aqueous solution of Y a white residue G. Both E and G impart yellow to yield blue coloration due to the formation of color to the Bunsen flame. The gas C reacts with methylene blue. Treatment of the aqueous solution heated Mg and forms white powder which on of Y with the reagent potassium hexacyanoferrate hydrolysis produces magnesium hydroxide. The colorless gas D reacts with heated calcium and the (II) leads to the formation of an intense blue product on hydrolysis gives NH , identify A to G. precipitate. The precipitate dissolves on excess 3 Q 3: A colorless poisonous gas A on heating in air gives addition of the reagent. Similarly, treatment of the only two compounds B & C. The compound B is a solution ofY with the solution of potassium strong white dehydrating agent and the compound hexacyanoferrate(III) leads to a brown coloration C is a liquid at room temperature. Aqueous solution due to the formation of Z. [IIT 2009] of compound A and liquid C is a neutral to moist Q 15. The compound X is litmus paper. Whenever the gas A is passed (A) NaNO (B) NaCl 3 through copper sulphate solution a black ppt. D is (C) Na SO (D) Na S 2 4 2 formed which gets reduced to copper. Identify A to Q 16. The compound Y is D and gives the reactions involved. (A) MgCl2 (B) FeCl2 Q 4. Substance A is a gas with vapor density 8.5. on (C) FeCl (D) ZnCl 3 2 oxidation at high temperature with a platinum Q 17. The compound Z is catalyst it gives a colorless gas B, which rapidly (A) Mg [Re(CN) ] (B) Fe[Fe(CN) ] 2 6 6 turned brown in air, forming a gas C. B and C were (C) Fe4[Fe(CN)6]3 (D) K2Zn3[Fe(CN)6]2 condensed together to give substance D, which

reacted with water, forming an acid E. on treatment of E with an acidified solution of KI, a gas B was evolved, but when E was treated with a solution of NH4Cl, a stable colorless gas F was evolved, F did not support combustion, but magnesium continued to burn in it. However, F reacted with calcium carbide in an electric furnace, forming a solid G, which was slowly hydrolyzed by water, forming a solution of substance A, which turned Nessler’s reagent yellow. Identify substance A to G and RISHI SIR [B.TECH. IIT KANPUR] www.atozchemistry.com 64 Be Topper with Topper in Chemistry in JEE Main & JEE-ADV Contact No. +91 9852476717

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explain the reaction involved. HCl on treatment with K4[Fe(CN)6] gives Q 5. A is binary compound with univalent metal. 1.422 a chocolate brown coloured ppt. of compound I. g of A reacts completely with 0.321 gm of sulfur identify A to I and give the chemical reactions. in an evacuated and sealed tube to give 1.743 gm Q 9. When 20.02 g of a white solid X is heated 4.4 g of of white crystalline solid, b that forms a hydrated an acid gas A and 1.8 g of a neutral gas B are salt C with Al2(SO4)3. Identify A, B and C. Evolved, leaving behind a solid residue Y of weight Q 6. A salt A on warming with NaOH solution gives out 13.8 g. A turns lime water milky and B condenses a pungent smelling gas B, which when passed into a liquid which changes anhydrous copper through a solution of copper sulphate gives a deep sulphate blue. The aqueous solution of Y is alkaline blue coloration. To the alkaline solution form the to litmus and gives 19.7 g of white precipitate Z above when aluminum powder is added, a further with barium chloride solution Z gives carbon quantity of gas B results. The salt A when heated dioxide with an acid. Indentify A, B, X, Y, and Z. carefully to a temperature above 240 0C Q 10. A lewis gas A on addition of NH Cl and NH OH decomposes completely without leaving any 4 4 gives a precipitate which dissolves in NaOH residue into two gases C and D. D exists as a liquid 0 solution. A on reaction with excess of B gives an below 100 C and C can be liquefied under pressure important reducing agent C. compound B on at room temperature. The gas C if moderately reaction with some other lewis acid D gives a inhaled induces laughter. Identify A, B , C & D. compound E which is electron deficient. Moreover name the analytical reagent E formed by addition E on reaction with NaH gives another reducing of mercuric chloride to excess KI solution. Indicate agent F which on reaction with a gas G gives the the color of the ppt. that gas B would formed with compound E. Identify A to E. the reagent. Q 11. A white colored inorganic salt gives following Q 7. 0. 347 gm o metal A was dissolved in dilute HNO3. reactions. Thus solution gives a red coloration to a non – (i) When exposed to H2S it becomes black luminous Bunsen burner flame, and on treatment (ii) It is decomposed by dil HCl evolving a gas with give 0.747 gm of metal oxide B. A also reacted effervescences, the gas turns lime water milky (iii) When heated strongly to about 450oC it with nitrogen forming a compound C and with decomposes to give three gases and leaves a red hydrogen forming D. on reacting 0.1590 gm of D colored residue used by housewives. Identify with water, a gas E was evolved and a sparingly compound X and the four gases evolved during soluble compound F is formed, which gave a reactions giving necessary chemical reactions. strongly basic reaction and required 200 ml of 0.1 Q 12. An inorganic compound(X) gives a brick red flame M hydrochloric acid to neutralize it. Identify the on performing flame test . This compound also substances A to F and explain the reaction Gives the following tests involved. (i) Smells of chlorine when placed in moist air. Q 8. A bluish colored compound A on heating gives two (ii) If KI and CH3COOH are added to its products B and C. The compound B whenever suspension in water a brown colour is obtained. treated with gas D evolves another gas E, a metal F Identify(X) and write down equations and a liquid G. the gas E when heated with Q 13. A white solid (A) when heated loses 16.25% of its weight & converted into a yellow solid B; while B calcium followed by hydrolysis produces the gas D when heated in presence of air gains its weight and and an alkaline solution. The solution on exposure converted into a red coloured solid C. C is partly to air produces the gas D & an alkaline solution. soluble in dil. HNO3 leaving a brown residue D. A The solution on exposure to air produces a thin is not complete soluble in dil. HCl or H2SO4 but solid layer H on the surface. The same compound dissolves in dilute HNO3 with effervescences H can be obtained by passing gas C through the forming a clear solution E. E reacts with sodium same alkaline solution. Future the solution B in hydroxide solution followed by chlorine water to give D. identity A to E.

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14. Subjective Problems on Salt Analysis yellow solution B, which changes to yellow ppt F Q 1. An inorganic mixture containing one or more of on treatment with lead acetate. Compound C when the following cation is given is given to you treated with ammonium chloride forms a 2+, 2+, 2+, 2+, 3+, 2+ Ag+ , Hg2 Hg Cu Fe Cr and Zn compound G which decomposes in heating giving a Identify the inorganic salt A whose aqueous colorless gas H, water and a green residue I. when solution given following reactions. mg is brunt in the presence of gas H, it gives a (i) Yellow precipitate with silver nitrate solution, white solid J which on hydrolysis forms a gas K soluble in dil. HNO3 which gives white fumes with HCl gas. Also the (ii) White precipitate with NH4OH and also NaOH compound D gives golden yellow color to the and also with sodium hydroxide solution. flame. Identify A to K giving the involved reaction. However, the precipitate dissolves in excess of Q 5. A yellow solid is unaffected by the acids and bases. NH4OH and NaOH respectively. It is not soluble in water dissolves slowly in hot Q 2. An inorganic sodium Salt (A) gives two colourless conc. HNO3 and a brown gas B is evolved. The gases (B) and (C) leaving a resdue (D). (B) turns solid A dissolves slowly in a boiling solution of white copper sulphate blue, while (C) turns lime Na2SO3 to give a clear solution of C. Acidification water first milky and then colourless. The residual of C causes evolution of a colorless gas D leaving solid (D) when heated strongly gives substances behind a milky precipitate E in the solution. (E) & (F). (E) gives whiter precipitate with BaCl2 Identify A to E and give the reactions involved. (F) when treated with dil. HCl gives a gas (G) Q 6. A colorless solid A on hydrolysis produces a heavy which when passed through a solution of sulphur white ppt. B solid A gives a clear solution in conc. dioxide gives a yellow precipitate due to (H). HCl however when added to large amount of water, Identity (A) to (H) with proper reasoning. it again gives ppt. of B. When H2S is passed Q 3. (1) An aqueous solution of white compound A on through a suspension of A and B, a brown black reaction with HCl gives a white ppt. B. ppt. of C is obtained. Compound A liberates a gas (2) B becomes soluble in chlorine water the D on heating with H2SO4. The gas D is water formation of C. soluble and gives white ppt. E withsolution of (3) C reacts with KI to give a ppt. which becomes mercureous salt but not with mercuric salt. Identify soluble in excess of it forming a compound D. A to E. Also report A, B, C if C is orange ppt. The compound D is used for detecting ammonium Q 7. A metallic chloride A does not respond to the salts. chromyl chloride test but on treatment with B give (4) B and C both, on treatment with SnCl2 give a a scarlet – ppt C which dissolves in excess of B grey ppt. of E. forming an important laboratory reagent D. the (5) When conc. H2SO4 is added slowly into a compound B on acidification and on treatment with mixture of cold solutions of A & FeSO4, a brown another compound X, which removes black stains ring of compound F is formed. Identity A to F & form paintings, gives iodine which dissolves in give chemical equations for reaction at steps 1 to 5. excess of B giving a yellow solution. Identify A, B, Q 4. A metallic chloride A when treated with NaOH and C, D and X. Also give the chemical equation. H2O2 gives a yellow solution due to the formation Q 8. (1) A white ppt B is formed when a mineral A is of compound B. The color of this solution changes boiled with Na2CO3 solution. to orange color when dilute sulphuric acid is added (2) The precipitate is filtered and the filterate to it. It is due to the formation of compound C. contains two compounds C and D. The compound whenever the compound D is heated along with C C is removed by crystallization and when CO2 is in the presence of concentrated H2SO4 a red passed through the mother liquor left, D volatile liquid E is formed. E dissolves in NaOH changes to C. giving yellow solution B, which changes to yellow (3) The compound C on strong heating gives two ppt F is formed . E dissolves in NaOH giving compounds D and E.

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(4) E on heating with cobalt oxide produces blue capable of decolorizing acidic KMnO4 solution. A coloured substance F. Identify A to F and solution of C becomes purple in color when aqs give chemical equations for the reactions at steps FeCl3 is added. compound E forms a yellow ppt G (1) to (4). with AgNO3 solution which is insoluble in HNO3 Q 9. A black mineral A on treatment with dilute sodium as well as in NH4OH. Compound A imparts a chloride solution in presence of air gives a clear golden yellow colour to the Bunsen flame. Identify solution of B and C. The solution of B on reaction the compound A to G. with zinc gives ppt. of a metal D. D is dissolved in Q 13. There is a substance S. It dissolves completely in dil. HNO3 and the resulting solution gives a white HCl resulting in the formation of a solution A. The ppt E with dil HCl. E on fusion with sodium solution A on addition of NH4Cl followd by carbonate gives D. E dissolves in aqs solution of NH4OH gives ppt B. When B is treated with ammonia giving a colourless solution of F. Identify NaOH a part of it dissolves to give solution C while A to F. rest of it remains as residue D. The solution C on Q 10. A soluble compound of a poisonous element M addition of solid NH4Cl and boiling gives when heated with Zn/H2SO4 gives a colorless and gelatinous ppt E. Residue D on treatment with extremely poisonous gaseous compound n which Na2O2 and heat gives a solution F and residue G. F on passing through a heated gives a silvery mirror on acidification with acetic acid followed by of element M. Identify M and N. addition of (CH3COO)2Pb gives yellow ppt. H Q 11. On mixing the aqueous solution of compound A residue G when dissolved in HCl and treated with and B an insoluble compound C is formed along K4[Fe(CN)6] gives blue ppt I. identify A to I and with another water soluble compound D. write in terms of their chemical formula. compound A on heating gives NO2 gas with a Q 14. A black colored compound A on reaction with dil. cracking noice. An aqueous solution of compound H2SO4 gives a gas B which on passing in a solution A gives black ppt with H2S. Compound A also of an acid C gives a white turbidity D. Gas B when gives white ppt with dilute HCl which is soluble in passed in an acidified solution of a compound E hot water and reappears on cooling. The hot water gives a ppt F soluble in dil. HNO3. After boiling extract of compound A gives yellow ppt with this solution when an excess of NH4OH is added, a K2CrO4 solution. Compound b gives a white ppt blue colored compound G is formed. To this with BaCl2 solution. This white ppt is insoluble is solution on addition of acetic acid and aqs concentrated HCl and is also in concentrated K4[Fe(CN)6] a chocolate ppt H is obtained. On HNO3. Filtrate containing compound D gives addition of an aqs solution of BaCl2. to an aqs following reactions. solution of E, a white ppt insoluble in HNO3 is (1) Deep blue colored solution with K3[Fe(CN)6]. obtained. Identify the compounds from A to H. (2) Yellow coloured solution with a little Q 15. An iodide (A) on heating with alkali (KOH) gives a Conc. HNO3 which gives brown ppt with NH4OH. gas (B) and a compound (C).The gas (B) burns in (3). It also gives brown ring test. air to give compound (D). When (B) is passed Identify A, B, C and D. through a solution of copper sulphate, it is finally Q 12. An inorganic salt A is water – soluble in nature. On reduced to the metal. A solution of (C) reacts with treatment with conc. H2SO4 , A gives a colorless CuSO4 to give a white ppt (E). Identify (A) to (E) pungent smelling gas B which has bleaching giving reactions. properties. When an aqueous solution of A is boiles with sulpur and then evaporated, compound C is obtained. When C react with iodine solution, the brown color of the halogen is discharged forming D and E. Compound C on treatment with HCl forms a pale yellow insoluble solid F and B which is a gas

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Answer Key 1. Solubility & Colour of Compounds 7. Class B Anions (1). A (2). C (3). B (1). B (2). D (3). B (4). D (5). D (6). D (4). B (5). A (6). D (7). D (8). A, B, D (9). C (7). B (8). A (9). D (10). B (11). A (12). A (10). D (13). C 8. Classification of cations 2. Properties of Gases & Compounds (1). B, D (2). D (3). D (1). C (2). A (3). A, C, D (4). D (5). B (6). C (4). A, B, D (5). D (6). C (7). C (8). A (9). C (7). A (8). B (9). C (10). D (11). B (12). A (10). B (11). A (12). D (13). B (14). C (15). D (16). D 3. Flame Test, Borax Bead & Phosphate Bead test 9. Group I, Group II & Group III cations (1). C (2). C (3). A (1). C (2). C (3). C (4). B (5). B (6). A (4). A (5). D (6). A (7). A (8). B (9). D (7). A (8). C (9). A (10). A (11). B (12). C (10). B (11). B (12). A (13). C (14). C (15). C (13). B

4. Bead Test, Cobalt Nitrate 10. Group IV & Group V cations & Charcoal cavity test (1). C (2). A (3). D (1). C (2). B (3). A (4). A (5). B (6). B (4). A (5). A (6). B (7). C (8). B (9). C (7). C (8). D (9). A (10). B (11). C (12). B (10). D (11). C (13). D (14). C (15). D

5. Class A(i) Anions 11. Identification of Cations (1). A (2). D (3). A (1). D (2). A (3). B (4). A (5). C (6). B (4). A (5). A (6). D (7). C (8). C (9). C (7). A (8). C (9). D (10). C (11). D (12). C (10). A (11). D (12). A (13). D (14). A (15). B (13). B

12. Passage Type questions 6. Class A(i) & Class A(ii) Anions (1). A (2). C (3). C (1). A (2). A (3). B (4). B (5). B (6). C (4). B (5). C (6). B (7). C (8). D (9). B (7). A (8). D (9). C (10). B (11). B (12). C (10). B (11). B (12). A (13). D (14). B (15). D (13). B (14). B (16). C (17). B

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AtoZ CHEMISTRY Salt Analysis

13. Subjective Problems on Salt Analysis (1). (5). A = Ca B = H2 C = Ca(OH)2 A = KO2 B = K2SO4 D = LiH E = LiOH F = CaCO3 C = K2SO4.Al2(SO4)3.24H2O G = Ca(HCO3)2 (6). (2). A = NH4NO3 B = NH3 A = NaNO3 B = NaNO2 C = O2 C = N2O D = H2O D = N2 E = NaCl F = N2O E = NEssler’s Reagent, Brown G = Na2SO4 (3). (7). A = PH3 B = P4O10 C = H2O A = Li B = Li2O C = Li3N D = LiH E = H2 D = LiOH D = Cu3P2

486PHOPOHO324102+→+ MCOMClCO⎯⎯⎯→+dil. HCl ()()()ABC (8). 322 ()()AB 233PHCuSOCuPHSO343224+→+ COCa+⎯⎯→+⎯⎯→ OHCaCOH()() OCa HCO  ().ABlackppt 22323 2 (C)() D (D)

(4).  Pt MCOMOCO32⎯⎯→+ (iNHONOH ) 4546322+⎯⎯→+ O ()()AE ()()AB M may be Barium, as we get green colour in (ii ) 4 NO+ 5 O ⎯⎯→ 4 NO 22 Bunsen Flame. (B) (C) meqA = meqE = meqHCl ()iiiNONON+⎯⎯→ O 1.97352100020.302500.0985 223 = (D) Mol..25 wt Molar weight = 196.3 ()2ivN OH OHNO+⎯⎯→ 2322 Which confirms that M is Ba (E) (9). X = KHCO3 A = CO2 B = H2O (vHNOKIIH ) 422 222+⎯⎯→++ ONO Y = K2CO3 Z = BaCO3 (E) (10). ()viHNONH+⎯⎯→ ClN A = AlCl3 B = LiH C = LiAlH4 242 (E)(F) D = BF3 E = B2H6 F = NaBH4 G = I2 ()vii CaC22+ N ⎯⎯→ CaNCN + C (11). X = PbSO4.2H2O (F) calcium Cynamide Four gases are SO3, SO2 , O2 & H2O ()G (12). X = Ca(OCl)Cl

(i )()() Ca OCl Cl+⎯⎯→+ H222 OCa OHCl (viii ) CaNCN+ 5 H2 O ⎯⎯→ CaCO + 3 2 NH 4 OH (ii ) Ca ( OCl )(CH Cl+⎯⎯→++ CH COO) COOHCaH O Cl (G) (A ) 33222  Nesseler' s reagent ClKIKClI+⎯⎯→+ 22 Yellow (13). A = PbCO3 B = PbO C = Pb3O4 D = PbO2 E = Pb(NO3)2

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AtoZ CHEMISTRY Salt Analysis

HgClKIHgIKCl+⎯⎯→+22 14. Subjective Problems on Salt Analysis (7). 22 (1). ZnI2 ABC (2). HgI2+2 KI ⎯⎯→ K 2 HgI 4 A = NaHSO B = H O C = SO 3 2 3 CBD D = Na2SO3 E = Na2SO4 F = Na2S 22KIHSOHOIKSOHO++⎯⎯→++ G = H2S H = S 24222242 BX 2NaHSONaSOHOSO32322⎯⎯→++ (8). NaSONaSONaS23242 ⎯⎯→+ Ca26112332472 B ONa+⎯⎯→++ COCaCONa22 B ONaBO

Na2 SO 4+ BaCl 2 ⎯⎯→ BaSO + 4 2 HCl AB 42NaBOCONaB+⎯⎯→+ ONa CO NaSHClHSNaCl22+⎯⎯→+ 2 2224723 DC HSSOSHO222 +⎯⎯→+ NaB ONaBOB⎯⎯⎯⎯→+Strong O 2 (3). 247223 DCE A = Hg2(NO3)2 B = Hg2Cl2 C = HgCl2 D = K2HgI4 E = Hg F = FeSO4.NO BOCoOCoBO+⎯⎯→ () 2322 (4). EF 2103368CrClNaOHH++⎯⎯→++ ONa CrONaClH O 32 2242 (9). (AB )( ) A = Ag2S B = Na[Ag(CN)2] C = Na2S

236Na242422 CrOH 7242+⎯⎯→++ SONa Cr ONa SOH O D = Ag E =AgCl F = Ag(NH3)Cl

(B)(C) (10). ZnH+⎯⎯→+ SOZnSOH244 2

46263NaClNa++⎯⎯→++ Cr22 OH 7242 SOCrO 242 ClNaHSOH O AsCl33+6 H ⎯⎯→ AsH + 3 HCl ( N ) (D)(E)  22(M)3AsHAsH32⎯⎯→+ CrO224 ClNaOHNaCrONaCl+⎯⎯→+422 (11). NaCrOPb43243+⎯⎯→+ CH()2 COOPbCrOCH COONa A = Pb(NO3)2 B = FeSO4 C = PbSO4

42()2Na22 Cr 744 ONH 22+⎯⎯→+ 7 ClNHCr ONaCl D = Fe(NO3)2 (12). ()4NHCr4 2272223 ONH⎯⎯→++ OCr O A = Na SO B = SO C = Na S O ()(HI ) 2 3 2 2 2 3 D = Na2S4O6 E = NaI F = S 3()MgNMg+⎯⎯→⎯⎯→+ NMg OHNH 23223 G = AgI ()(J)(K)H (13). S = Al, Cr, Fe A = Chlorides B = Hydroxide SHNOH+⎯⎯→++662 SONOH32422 O (5). of Al, Cr & Fe of Al, Cr & Fe AB C = NaAlO2 D = Fe(OH)3, E = Al(OH)3 Na SO+ S ⎯⎯→ Na S O 2 3 2 2 3 Cr(OH)3 C F = Na2CrO4 G = Fe(OH)3 H = PbCrO4 Na S O+ H SO ⎯⎯→ Na SO + H O + +S SO I = Fe4[Fe(CN)6] 2 2 3 2 4 2 4 2 2 ED (14). (6). (A)FeS, CuS, PbS, HgS, CoS, NiS (B) H2S (C) HNO3 (D) S (E) CuSO4 A = BiCl3 B = BiOCl C = Bi2S3 (F) CuS (G)Cu(NH3)4(NO3)2 (H)Cu2Fe(CN)6 D = HCl E = Hg2Cl2 If C is orange, then (15). (A) PH4I (B) PH3 (C) KI A = SbCl3 B = SbOCl C = Sb2S3 (D) P2O5 (E) Cu2I2

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