Practice Questions

Q40.The solubility (in mol L−1 ) of AgCl (Ksp = 1.0 × 10−10) in a 0.1MKCl solution will be (1) 1.0 × 10−9 (2) 1.0 × 10−10 (3) 1.0 × 10−5 (4) 1.0 × 10−11

Q41.Given (i) HCN(aq) + H2O(b) ⇌H3O+(aq) + CN−(aq) Ka = 6.2 × 10−10 (ii) CN−(aq) + H2O(l) ⇌HCN(aq) + OH−(aq) Kb = 1.6 × 10−5 . These equilibria show the following order of the relative base strength, (1) OH−> H2O > CN− (2) OH−> CN−> H2O (3) H2O > CN−> OH (4) CN−> H2O > OH−

Q41.The value of Kp for the equilibrium reaction N2O4(g) ⇌2NO2(g) is 2 . The percentage dissociation of N2O4(g) at a pressure of 0.5 atm is (1) 25 (2) 88 (3) 50 (4) 71

Q41.Which of the oxide groups among the following cannot be reduced by carbon? (1) Cu2O, SnO2 (2) CaO, K2O (3) PbO, Fe2O4 (4) Fe2O3, ZnO

Q41. In the following compounds: the order of basicity is as follows (1) IV > III > II > I (2) III > I > II > IV (3) II > III > I > IV (4) I > III > II > IV

Q42.Ortho-Nitrophenol is less soluble in water than p− and m− Nitrophenols because : JEE Main 2012 (Offline) JEE Main Previous Year Paper (1) o−Nitrophenol is more volatile in steam than (2) o−Nitrophenol shows Intramolecular H− those of m− and p− isomers bonding (3) o− Nitrophenol shows Intermolecular H− (4) Melting point of o−Nitrophenol is lower than bonding those of m− and p− isomers. Q43. 2− Hexyne gives trans −2−Hexene on treatment with : (1) Pt/H2 (2) Li/NH3 (3) Pd/BaSO4 (4) LiAlH4

Q42.Which of the following cannot be represented by resonance structures? (1) Dimethyl ether (2) Nitrate anion (3) Carboxylate anion (4) Toluene

Q42.If Ksp of CaF2 at 25∘C is 1.7 × 10−10 , the combination amongst the following which gives a precipitate of CaF2 is (1) 1 × 10−2MCa2+ and 1 × 10−3MF− (2) 1 × 10−4MCa2+ and 1 × 10−4MF− (3) 1 × 10−2MCa2+ and 1 × 10−5MF− (4) 1 × 10−3MCa2+ and 1 × 10−5MF−

Q43.Which of the following compounds are antiaromatic (1) (I) and (V) (2) (II) and (V) (3) (I) and (IV) (4) (V) and (VI)

Q43.A metal M on heating in nitrogen gas gives Y . Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. Y is (1) NH3 (2) Mg(NO3)2 (3) Mg3 N2 (4) MgO

Q44. The IUPAC name of the following compound is (1) (E)-2-hepten-4-yne (2) (Z)-5-hepten-3-yne (3) (E)-5-hepten-3-yne (4) (Z)-2-hepten-4-yne

Q44.Consider the following sequence of reactions Compound ' C ' is JEE Main 2012 (26 May Online) JEE Main Previous Year Paper (1) (2) (3) HOCH2 −CH = CH2 (4)

Q44.The IUPAC name of the compound < smiles>CC1CO1 < /smiles> is (1) 1, 2-Propoxide (2) Propylene oxide (3) 1,2-Oxo propane (4) 1, 2-Epoxy propane

Q44.In the below mentioned compounds the decreasing order of reactivity towards electrophilic substitution is (i) (ii) JEE Main 2012 (12 May Online) JEE Main Previous Year Paper (iii) (iv) (1) (iv) > (i) > (ii) > (iii) (2) (ii) > (iii) > (i) > (iv) (3) (iii) > (i) > (iv) > (ii) (4) (i) > (ii) > (iii) > (iv)

Q45.Among the following the order of reactivity towards nucleophilic addition is (1) CH3CHO > CH3COCH3 > HCHO (2) HCHO > CH3CHO > CH3COCH3 (3) CH3CHO > HCHO > CH3COCH3 (4) CH3COCH3 > CH3CHO > HCHO

Q46. Kf for water is 1.86 K kg mol−1 . If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2H6O2) must you add to get the freezing point of the solution lowered to −2.8∘C ? (1) 72 g (2) 93 g (3) 39 g (4) 27 g

Q46.Green house gases can be arranged in 'Global Warming Potential' sequence as (1) N2O > CFC > CH4 > CO2 (2) CFC > N2O > CH4 > CO2 (3) CFC > CO2 > N2O > CH4 (4) CO2 > CFC > N2O > CH4 JEE Main 2012 (07 May Online) JEE Main Previous Year Paper

Q46.Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is 180pm, the size of ammonium ion would be (1) 174pm (2) 158pm (3) 142pm (4) 126pm

Q46.Among the following the incorrect statement is (1) Density of crystals remains unaffected due to (2) In BCC unit cell the void space is 32%. Frenkel defect. (3) Density of crystals decreases due to Schottky (4) Electrical conductivity of semiconductors and defect. metals increases with increase in temperature.

Q47.Liquids A and B form an ideal solution. At 30∘C, the total vapour pressure of a solution containing 1 mol of A and 2 mol of B is 250 mmHg . The total vapour pressure becomes 300 mmHg when 1 more mol of A is added to the first solution. The vapour pressures of pure A and B at the same temperature are (1) 150, 450mmHg (2) 125, 150 mmHg (3) 450, 150 mmHg (4) 250, 300 mmHg

Q47.The radius of a calcium ion is 94pm and of the oxide ion is 146pm. The possible crystal structure of calcium oxide will be (1) tetrahedral (2) trigonal (3) octahedral (4) pyramidal

Q47.The standard reduction potentials for Zn2+/Zn, Ni2+/Ni, and Fe2+/Fe are −0.76, −0.23 and −0.44 V respectively. The reaction X + Y2+ →X2+ + Y will be spontaneous when: (1) X = Ni, Y = Fe (2) X = Ni, Y = Zn (3) X = Fe, Y = Zn (4) X = Zn, Y = Ni

Q47.The freezing point of a 1.00 m aqueous solution of HF is found to be −1.91∘C. The freezing point constant of water, Kf is 1.86 K kg mol−1 . The percentage dissociation of HF at this concentration is (1) 30% (2) 10% (3) 5.2% (4) 2.7%

Q48.The standard potentials of Ag+/Ag, Hg2 2+/2Hg , Cu2+/Cu and Mg2+/Mg electrodes are 0.80, 0.79 , 0.34 and −2.37 V, respectively. An aqueous solution which contains one mole per litre of the salts of each of the four metals is electrolyzed. With increasing voltage, the correct sequence of deposition of the metals at the cathode is (1) Ag, Hg, Cu, Mg (2) Cu, Hg, Ag only (3) Ag, Hg, Cu only (4) Mg, Cu, Hg, Ag

Q48.Given E∘ = 0.34 V, E∘ = 0.15 V Cu2+/Cu Cu2+/Cu Standard electrode potential for the half cell Cu+/Cu is (1) 0.38 V (2) 0.53 V (3) 0.19 V (4) 0.49 V