Practice Questions

Q35.If 100 mole of H2O2 decompose at 1 bar and 300 K, the work is done ( kJ) by one mole of O2(g) as it expands against 1 bar pressure is: 2H2O2(l) ⇌2H2O(l) + O2(g) (R = 8 .3 J K−1 mol−1) (1) 124. 50 (2) 249. 00 (3) 498. 00 (4) 62. 25

Q35.Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure pi and temperature T1 are connected through a narrow tube of negligible volume, as shown in the figure below. The temperature of one of the bulbs is then raised to T2. The final pressure Pf is: 2pi (1) 2pi( T1+T2T2 ) (2) T1T2 ( T1+T2 ) (3) pi ( T1+T2T1T2 ) (4) 2pi( T1+T2T1 )

Q36.Which intermolecular force is most responsible in allowing xenon gas to liquefy? (1) London forces (2) Ion-dipole (3) Ionic (4) Dipole-dipole

Q36.A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. Kp for this reaction is? (1) 25 (2) 100 (3) 10 (4) 5

Q36.The heats of combustion of carbon and carbon monoxide are −393.5 and −283.5 kJ mol−1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is: (1) − 676.5 (2) −110 (3) 110.5 (4) 676.5

Q37.The volume of 0.1 M strong dibasic acid sufficient to neutralize 1g of a base that furnishes 0.04 mole of OH− in aqueous solution is : (1) 400 mL (2) 600 mL (3) 200 mL (4) 800 mL

Q37.For the reaction, A(g) + B(g) →C(g) + D(g), Δ Ho and ΔSo are, respectively, −29.8 kJ mol−1 and −0.100 kJ K−1 mol−1 at 298 K. The equilibrium constant for the reaction at 298 k is: (1) 1.0 × 10−10 (2) 10 (3) 1 (4) 1.0 × 1010

Q37.The equilibrium constant at 298 K for a reaction A + B ⇌C + D is 100. If the initial concentration of all the four species were 1 M each, then the equilibrium concentration of D (in mol L−1 ) will be: (1) 1. 818 (2) 1. 182 (3) 0. 182 (4) 0. 818

Q38.A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following: (1) ΔH is negative while ΔS is positive (2) Both ΔH and ΔS are negative (3) ΔH is positive while ΔS is negative (4) Both ΔH and ΔS are positive

Q38.What is the commercial name for calcium oxide? (1) Quick lime (2) Milk of lime (3) Slaked lime (4) Limestone

Q38.Which of the following statements about water is FALSE? JEE Main 2016 (03 Apr) JEE Main Previous Year Paper (1) There is extensive intramolecular hydrogen (2) Ice formed by heavy water sinks in normal water. bonding in the condensed phase. (3) Water is oxidized to oxygen during (4) Water can act both as an acid and as a base photosynthesis

Q39.Identify the incorrect statement regarding heavy water: (1) It reacts with SO3 to form deuterated sulphuric (2) It is used as a coolant in nuclear reactors. acid (D2SO4) . (3) It reacts with CaC2 to produce C2D2 and (4) It reacts with Al4C3 to produce CD4 and Ca(OD)2 . Al(OD)3 . JEE Main 2016 (09 Apr Online) JEE Main Previous Year Paper

Q39.The main oxides formed on combustion of Li, Na and K in excess of air are respectively: (1) Li2O2, Na2O2 and KO2 (2) Li2O, Na2O2 and KO2 (3) Li2O, Na2O and KO2 (4) LiO2, Na2O2 and K2O

Q39.Identify the reaction which does not liberate hydrogen (1) Reaction of lithium hydride with B2H6 . (2) Electrolysis of acidified water using Pt electrodes. (3) Reaction of zinc with aqueous alkali. (4) Allowing a solution of sodium in liquid ammonia to stand.

Q40.The correct order of the solubility of alkaline-earth metal sulphates in water is: (1) Mg > Ca > Sr > Ba (2) Mg > Sr > Ca > Ba (3) Mg < Ca < Sr < Ba (4) Mg < Sr < Ca < Ba

Q40.Assertion: Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity. Reason: Hybridization of carbon in diamond and graphite are sp3 and sp2 respectively. (1) Both assertion and reason are correct, but the (2) Both assertion and reason are correct, but the reason is not the correct explanation for the reason is the correct explanation for the assertion. assertion. (3) Both assertion and reason are incorrect. (4) Assertion is incorrect statement, but the reason is correct. JEE Main 2016 (10 Apr Online) JEE Main Previous Year Paper

Q40.The absolute configuration of is: (1) (2S, 3S) (2) (2R, 3R) (3) (2R, 3S) (4) (2S, 3R)

Q41.Sodium extract is heated with concentrated HNO3 before testing for halogens because : (1) Ag2S and AgCN are soluble in acidic medium. (2) Silver halides are totally insoluble in nitric acid. (3) S2− and CN− , if present, are decomposed by (4) Ag reacts faster with halides in acidic medium conc. HNO3 and hence do not interfere in the test.

Q41.Match the items in Column I with its main use listed in Column II: Column I Column II A Silica gel i. Transistor B Silicon ii. Ion-exchanger C Silicone iii. Drying agent D Silicate iv. Sealant (1) A − iii, B − i, C − iv, D −ii (2) A − iv, B − i, C − ii, D − iii (3) A − ii, B − i, C − iv, D − iii (4) A − ii, B − iv, C − i, D − iii

Q41.The distillation technique most suited for separating glycerol from spent - lye in the soap industry is: (1) Steam distillation (2) Distillation under reduced pressure (3) Simple distillation (4) Fractional distillation

Q42.The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is: (1) 2, 2 −dimethyl −4 −pentene (2) 4, 4 −dimethylpent −1 −ene (3) Isopropyl −2 −butene (4) 2, 2 −dimethyl −3 −pentene Q43. 5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is (1) Isobutane (2) Ethane (3) Butane (4) Propane

Q42.The reaction of propene with HOCl (Cl2 + H2O) proceeds through the intermediate: (1) CH3 −CH(OH) −CH+2 (2) CH3 −CHCl −CH+2 (3) CH3 −CH+ −CH2 −OH (4) CH3 −CH+ −CH2 −Cl

Q42.Consider the reaction sequence below: X is : (1) (2) (3) (4)

Q43.The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0. 2 ppm, respectively. This water is unsuitable for drinking due to high concentration of: (1) Nitrate (2) Iron (3) Fluoride (4) Lead Q44. 18 g glucose (C6H12O6) is added to 178. 2 g water. The vapour pressure of water (in torr) for this aqueous solution is: (1) 752. 4 (2) 759. 0 (3) 7. 6 (4) 76. 0

Q43.Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution? (1) Sulphur dioxide (2) Carbon dioxide (3) Nitrogen dioxide (4) Tetrachloroethylene