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12Th-Chemistry-Interior-Questions.Pdf www.Padasalai.Net www.TrbTnpsc.com XII STANDARD CHEMISTRY ONE MARKS [2010 – 2011] 1. The wavelength associated with a particle mass 3.313x10-31 kg moving with velocity of 103 ms 1 is a) 2x10-6m b) 2x10-6cm c) 2x10-7m d) 2x10-7cm 2. Which one of the following particle having same kinetic energy, would have the maximum de – Broglie wave length? a) α – particle b) proton c) - particle d) neutron 3. Which is the most stable molecule? a) N2 b) O2 c) He2 d) Li2 4. The compound formed by SP hybridization is a) NH3 b) CH4 c) BeCl2 d) C2H4 5. Paramagnetic nature can be seen in the molecule having a) a paired electron b) a lone pair of electron c) lone electron d) all of these 6. Bond order can be calculated using the formula a) ½ (Nb-Na) b) ½ (Na-Nb) c) 2 (Na-Nb) d) 2 (Nb-Na) 7. Which is incorrect? a) bond order may be fractional b) if Nb>Na molecule is stable c) greater the bond length stronger the bond d) if Nb=Na molecule is unstable 8. Which is the correct form of Heisenberg’s uncertainity principle? a) X. V = h/4π b) X. p < h/4π c) X. P > h/4π d) X. p > h/2π 9. De – Broglie’s wavelength of a particle is 1x10-10cm then its momentum is a) 6.63x10-24kg ms-1 b) 6.63x10-32kg ms-1 c) 6.63 x10-31kg ms-1 d) 6.63x10-29kg ms -1 10.Which is used by Thomson for his experiment to study the diffraction pattern of electron? a) Gold b) Nickel c) Zinc sulphide d) Silver - 11.The hybridization present in ICl4 is a) sp3 b) dsp3 c) sp3d2 d) sp2 12.The strength of hydrogen bond in decreasing order is www.Padasalai.Neta) H-F>H2O>NH3 b) NH3>H2O>HF c) HF>NH3>H2O d) H2O>HF>NH3 13.3S – orbital has a) 1 nodal plane b) 2 nodal plane c) 2 spherical node d) 4 nodal plane 14.The value of Bohr radius of hydrogen atom is a) 0.529x10-8cm b) 0.529x10-10cm c) 0.529x10-6cm d) 0.529x10-12cm 15.The stability of a molecule is directly proportional to a) electron density b) bond order c) electronegativity d) all of these 16.Which one of the following has the lowest ionisation energy? a) Lithium b) Berilium c) Boron d) Carbon 17.The correct order of ionic radii of halide ion is a) F- > Cl- > Br->I- b) Cl- >F- > Br- > I- c) I- > Br- > Cl- > F- d) Br- >F- > I- > Cl- 18.The effective nuclear charge of Cl- ion is a) 5.75 b) 7.75 c) 10.2 d) 16.8 19.The order of ionization energy a) s<P<d<f b) s>p>d>f c) s>d>p>f d) s<d<p<f 20.Which is based on bond energy and electro negativity value a) Pauling’s scale b) Mellikan’s scale c) Sanderson scale d) Alfred scale 21.The electron gain enthalpy of noble gases is a) very high b) low c) zero d) very low 22.If XA = XB then the nature of bond formed between A-B is a) polar covalent b) non polar covalent c) ionic bond d) metallic bond 23.The lowest ionisation potential in a period is shown by a) alkali metals b) halogens c) noble gas d) alkaline earth metals 24.Effective nuclear charge value for the lost electron of an atom having the electronic configuration IS22S22P63S23P5 is a) 2.2 b) 6.1 c) 5.5 d) 4.4 25.By Slater’s rule we can determine a) screening constant b) effective nuclear charge c) electronegativity d) both a and b 26.The unit of Electronegativity is http://www.trbtnpsc.com/2013/07/latest-12th-study-materials-2013.html www.Padasalai.Net www.TrbTnpsc.com a) KJ b) J c) KJ.mol d) KJ mol-1 27.As we go down a group, ionisation potential a) increases b) decreases c) does not change d) varies irregularly 28.Which one of the following statements is true if K+ and Cl- are isoelectronic? a) Cl- ion is large than K+ b) K+ ion is large than Cl- c) both K+ and Cl- have the same ionic radii d) both K+ and Cl- have the same number of protons 29.Which one has the highest electronegativity value? a) Chlorine b) Bromine c) Iodine d) Fluorine 30.Covalent radii value of Chlorine atom is a) 1.54A0 b) 1.98 A0 c) 0.99 A0 d) 0.77 A0 31.Which one exist as a liquid in room temperature? a) Boron b) Aluminium c) Gallium d) Indium 32.General outermost electronic configuration of Boron group is a) ns2np1 b) ns2np2 c) ns2np3 d) ns2np1-6 33.Which is the most abundant in earth crust a) C b) Si c) Ge d) Sn 34.Which is used to purify water a) Potash b) Potash alum c) Silicone d) All of these 35.Trialkylmonochlorosilane on hydrolysis gives a) Hexa alkyl Slinae b) Chain polymer Silicone c) Crossed polymer Silicone d) Silicol 36.The electrolyte used during the purification of Lead is a) PbSiF6, H2SiF6 b) H2PbCl4, HCl c) PbSiF4, H2SiF6 d) H2PbCl4, H2SO4 37.Which is used in the preparation of insecticides? a) Nitrogen b) Arsenic c) Lead d) Silicon 38.Plumbo Solvency is due to the formation of a) PbO b) Pb3O4 c) Pb(OH)2 d) PbCl2 39.Which is used as antiknocking agent for petrol a) Pb(CH3)4 b) Pb(C2H5)4 c) Pb(OH)2 d) H2PbCl4 www.Padasalai.Net40.The chief ore of Lead is a) Argentite b) Zinc blende c) Calamine d) Galena 41.de-Broglie equation is a) λ = hv/m b) λ = hm/v c) λ=h/mv d) λ = hv/p 42.The intramolecular hydrogen bonding in molecules leads to a) high boiling point b) low boiling point c) low solubility in water d) both b and c 43.For an electron the uncertainity in velocity is 5.7x105m/sec. Then the uncertainity in its position is [h=6.626x10-34 Kgm2S-1, m=9.1x10-31 Kg] a) 1x10-9m b) 1A0 c) 1x10-10cm d) 1x10-8m 44.Which one of the following orbital is not in clover leaf shape? a) dxy b) dx2-y2 c) dz2 d) dyz 45.Energy of an electron in an atom is a) -4π2me4/n2h2 b) -2π2me2/n2h2 c) -2π2me4/n2h2 d) -2πme4/n2h2 46.Mathematical form of Pauling’s scale to determine electronegativity is X a) I.E+E.A/2 b) ∆ =XA-XB c) 0.208 ∆ =XA-XB d) Z = Z-A 47.In which case the bond between A and B is more than 50% ionic and less than 50% covalent? a) (XA-XB) >1.7 b) XA-XB = 1.7c) (XA-XB) <1.7 d) XA = XB 48.Potash alum is manufactured from a) alunite b) aluminon c) ferric alum d) chrone alum 49.The element with the highest ionisation potential is a) Boron b) Carbon c) Nitrogen d) Oxygen 50.Which is used for making thermistors? a) Indium b) Thallium c) Gallium d) Boron 51.The total number of atoms present in CsCl is (CsCl has bcc structure) a) 1 b) 2 c) 3 d) 4 52.An example for metal deficiency detect is a) NaCl b) AgCl c) CsCl d) FeS 53.In ZnO, the coordination number is a) 8 b) 6 c) 4 d) 3 54.Which one is not an example for AB2 type crystal? http://www.trbtnpsc.com/2013/07/latest-12th-study-materials-2013.html www.Padasalai.Net www.TrbTnpsc.com a) Cu2O b) TiO2 c) CO2 d) CsCl 55.Vitreous state is the state in between a) Solid and liquid b) Liquid and Gas c) Solid and Gas d) All of these 56.Which is correct regarding amorphous solid? a) They are non compression b) They didn’t have definite shape c) Atoms are not closely packed d) All of these 57.In fcc system A types atoms are occupying the corners and B type atoms are occupying face centres. Then the simple molecular formula of the compound is a) AB b) AB2 c) AB3 d) A3B 58.Bragg equation is a) λ = 2d sin b) nd = 2 sin c) 2 λ = nd sin d) n λ = 2d sin 59.An example for Frenkel defect is a) NaCl b) AgBr c) CsCl d) FeS 60.Those substance which conduct electricity with zero resistance at low temperature is known as a) Ionic conductor b) Semiconductor c) Super conductor d) Metallic conductor 61.In an ionic crystal some of the points are not occupied by the atoms, this type of defect is known as a) Schotty defect b) Frenkel defect c)Metal excess defect d) Metal deficient defect 62.Wavelength of X – rays are in the range of a) 10-8cm b) 10-8m c) 10-8mm d) 10-9m 63.The charge carries in p – type semiconductor are a) electrons b) protons c) neutrons d) positive holes 64.Glass is a) a microcrystalline solid b) a super cooled liquid c) a gel d) a polymeric mixture 65.The impurity added to silicon to act as a semiconductor is a) Arsenic b) Carbon c) Germanium d) Phosphorous www.Padasalai.Net66.The mathematical expressions used to represent the first law of Thermodynamics is a) Q=E-W b) Q = E+W c) Q=E/W d) Q = WE 67.For a spontaneous process, S(Unit) is a) zero b) greater than zero c) less than zero d) negative 68.The entropy of vapourisation of a liquid is equal to a) 20 Cal deg-1mol-1 b) 25 Cal deg-1mol-1 c) 21 Cal deg-1mol-1 d) 30 Cal deg 69.Enthalpy of vapourisation of water is 40850 jmol-1.
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