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2010 RJC CH H2 P1 Prelim Solutions

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2010 RJC CH H2 P1 Prelim Solutions [uni@- Sirn RAFFLES INSTITUTION Section A PRELIMINARY EXAMINATION 201 O For each question there are four possible answers, A, B, C, and O. Choose the one you Higher consider to be correct. 2 N. \milX6.rrrxro2' Which of the following particles particles g :)t rool I, stated contain an equal number of as 12 of GHEMISTRY 9647tol,9746tO1 A aqueous chloride ions in a solution containing 0.25 mol of the complex, B li# i"lll:',i;L?;" lfJ;;!., i3 f,"1,'i J, Ji H'n ro,xI' r x, Paper 1 Multiple Choice 27 September 2010 ]I i; m SI = r c oxygen atoms in 100 9 of"allactite, Mn7(AsO4)r(OH)8, of molar mass T9S g mol- - " " ' D oxygenatomsin22.4dm" of carbondioxidegasats.t.p. n^:1 IOO- Additional Materials: OMR Answer Sheet t hour rlrcrr\ " \-11ti/^''\X 16 = f rOO\ Data Booklet ho= *f*t D, Which of the following statements is correct? READ THESE INSTRUCTIONS FIRST A The first ionisation energy of rubidium is higher than the first ionisation energy of calcium. Do not open this question booklet until you are told to do so. B The first ionisation energy increases from sodium to phosphorus as the number of protons increases but number of inner quantum shells remains the same. Write in soft pencil. The second ionisation energy of chromium is lower than the second ionisation Do not use staples, paper clips, highlighters, glue or correction fluid. enefgy of manganese as manganese has one more proton than chromium. Write your name, class and index number in the spaces provided on the Answer Sheet. D The semnd ionisation energy of any element is always higher than its first ionisation energy as more energy is required to remove an electron from an positive There are forty questions on this paper. Answer all questions. For each question there are four increasingly more species possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate A Answer Sheet. 3 The boiling points (b.p.) of ammonia, carbon dioxide and hydrogen chlor,de are given n below. Read the instructions on the Answer Sheet very carefully. gas formula b.o. / "C Each correct answer will score one mark. A mark will not be deducted for a wrono answer. ammonta NH: 33 Any rough working should be done in this booklet- carbon dioxide CO -78 hvdrooen chloride HC/ Which of the following statements is correct? A NH3 has a higher b.p. than HC1 because the hydrogen bonding in NH3 is stronger than the permanent dipole-permanent dipole interactions in HC/. B CO2 has a higher b.p. than HC/ because the permanent dipole-permanent dipole interactions in CO2 are stronger than the permanent dipole-permanent dipole interactions in HC/. C The strength of the instantaneous qipole-induced dipole interactions Increases in the order HCi. CO,. NH,. ( dep. On nr. Ot e- -'(fFfqr {r N. ) D The strength of the permanent dipole-permanent dipole interactions increases in the order HC/ < co? < NH3 ,c\et. o{ ete$.€A ?" $ecfo"CAai;,riU + pJu.<$ crt nu\eu{q J This document consists of 17 printed pages n . (rxrlb)*(gx+oo1 Qr\e.k tI-Jts'oe'-J p;x&F, Frr,ta\ =\- ,o rD ,/ -: in \orgt acess" = 36o LPa r&\e.k,'tr-J C5,Or'-1 2LA P' L R P^ z+.ro r/-\n2\+ \n 0t'-) ." P. = LPo. Y = o roo 5*' [' =fL5' a = t € i#: = *- - t,, - 6-'{ r - 9-lQ9- A4 At 298 K. two bulbs are connected qy a stopcock. The 2 dmr bulb is filled with oxygen at lodide ions react with peroxodisulfate ions to form iodine and sulfate ions r- s.O a pressure of 200 kPa and the 8 dm' bulb is filled with nitrogen at 400 kPa. The stopcock b, -J1 1 is then opened to allow the gases to mix at 348 K. 2l-(aq) + Sros'?laq) ) Ir(aq) + 2so41(aq) - 0.O> rrot dm-5-' pressure, The final total in kPa, of the system at 348 K is The above reaction is first order with respect to F and 5206'- ions respectively. In an experiment, 5.0 mol dm-3 Na2S2Os was reacted with 0.025 mol dm-3 KL The halt-life for 310 A 420 B 400 C 360 D this reaction was found to be 6.9 s. What is the rate constant. in mol-l dm3 s-1. of this reaction? A gaseous dimer, J2, dissociates into its gaseous monomer, at 400 K and 1 atm J, A 0.01 B 0.02 c 0.1 D 0.2 )s pressure. Dissociation is complete at 450 K. T: * >3 Which of the following graphs shows the variation of volume with temperature when one Substances X, Y and Z react according to the following equation: mole of J2 rs heated from 350 K to 500 K at a constant pressure of 1 atm? Assume that Qa gases 11 the behave ideally. (R = 0.082 dm3 atm K X(aq) + 2Y(aq) + Z(aq) ) 2w(aq) + U(aq) A+ 45OK, , r n=) mo\'.' CDcneet( i\,SstX.rohon. 800R 800R PV < oR-T txl E E (x. \50 ! p.y= >-r 0.10 i +oon | +oon y= 10oR 0.08 0.06 500 r/ K 0.04 o.o2 800R E A rate = k[Y]'?[z] B rate = klxllYl[z] | +oon 9 Under extreme conditions, gallium chlorrde, Ga2C16 can be formed vta the dimerisation of s UdUlr s00 T/ K K 350 400 450 2GaCl3(S) + Garc16(g) ln an experiment, a total pressure of 7.75 x 1Ot Pa was measured when a R 6 When 25 cm3 of 1.0 mol dmi sodium hydroxide rs neutralrsed wrth an equal volume of 3.745 x 10 " mol sample of GaCl3 was allowed to dimerise in a 1.80 dm3 vessel at v I oC. 1 .O mol dm hydrochloric acid, the temperature of the mixture rose by 6.8 200 "c. oC, What will be the temperature change, if x cm3 of 0.5 mol dm-3 sodium hydroxide is Calculate o, the fraction of GaC/3 that dimerised at 200 assuming ideal gas neutralised with an equal volume of 0.5 mol dm-'hydrochloric acid? behaviour. (Assume heat losses to be negligible in each case.) A 0.053 B 0.105 c 0.895 D 0.947 A 1.7 B 3.4 13.6 c 6.8 D A'mtxn\/mu\ 6e,cl rcuc\3 € e gv:nRI -rIb+)5)X4i:!_6:--E_ _ t.rDtr rnot-, o At\qcrt = =_ b-t \n,ha\ 3'1+, Xlt's -l-1b\rglx .Oqm ---TRx r.o lVvirne -)x-. +x- a \.gaxt0-3 x6'3)x +13 ) r- B-r. \'13 cno\-' b1rn" 3.-1+)X19"-1t { $: 3 5\qxtril5 rnu\ *51't r :_ 2:LX4,lx AT \* = 31't51\o-j ->atx- / rcx0-5\ -: IOOO R 3.1+5X \0-3 *a- \ lbcD / 3'14!2q1s--r * )L : ) 5+4 n'{,J AT = 3.rf :t r \'15qXl0-+ "..r*=*##l: lU' The graph below shows how the fraction of a substance, X represented by one ot the Aluminium and silicon are consecutive elements in Period 3 of the Periodic Table. A,O following compounds in the equilibrium mixture shown below varies with temperature at A'o Which statement concerning the compounds of aluminium *and silicon is incorrect? oressures of Y Pa and Z Pa. F\$,'- gAl s\C\q Pvt :- give ) A Both their chlorides strdngly'acidic solutions when added to water. , _ \ 1 - 4NH3(g) + 3or(g) :2Nr(s; + OlzO(o) AH = -1267 kJ mol B Both their oxides give neutral solutions when added to water. ': bUtb inSSuB t L pH = t / points. C Both their oxides have high melting A\'05-g\ar* ioO,c ; :.tgr- g,qn\ f,,oVolhr 1 il\Dl D Both their chtorides are covatent. bt*t" ha.n_ :,- ' Fraction of X c \"hmIt,%X V s:i"gr" ,ro\eor6i- in equilibrium :\tn-\u{c . mixture / % =) ?r:E sh(b \etf (-0a'ur. The diagram shows ihe first ionisation energy of eight consecutive elements, P to W in e$o\hnr{Nl rXn) b'u the Periodic Table. Their atomic numbers lie between 3 and 20. r .'. \ q$ bq Nr or rl,O" t Qrn"\ 3 ZPa ' t .o*" f(c'.),% X is hgter{r.SPa &:,Qercur $ ?oE s[i(b coor q {o {hc \ofl vu .->' 6. z 9a '.' hqhr P (trnrrrg ldentify X and the correct relative magnitudes of Y and Z rxn V( tyd prr.lurL:' \usser iv X Pressure 0fc'.ufr\ ut gr,l A Nz Z>Y B Oz Y>Z c Hro \>z Which of the following statements is incorrect? D NH3 Z>Y A P forms an acidic oxide. r ^- ^^ ,.! . - \ B R is skonsly,oxidising5lNqg\) cc{Ugqg -: \o:p- \LNql@ * t*oO$\trt\( I I Which of the following conjugate acid-base pairs can be used to prepare a buffer of c u ooes not orssotve tn waler .b" D W forms a hydride of general formula HzW. approximately pH 6 that has maximum buffer capacity? p\\.tKo - \rI s A NH4" / NH3 t'k 10 mo, dm' pH='g(i*;)=:u Which one of the following statements concerning the thermal decompositions of B HrCO3/ HCO3 ^;;' es=Aci*$d' C., anhydrous magnesium nitrate and anhydrous barium nitrate is incorrect? c H3PO4 / H2PO4 f: :l ii,?. = ? 33 I l3j,Ti",o;i, a'd D CH3COOH / CH3COO- rii"iCii.cbo =rlj",.i, 9H= -!(uro-h,'1=llls-=- a.\a ';;;i;' ' 1'3]X\U{/\: A Lattice energy of magnesium nitratq is .r!9re €xothermic than that of barium pH.
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