Practice Questions

Q33.If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become (1) one fourth (2) half (3) four times (4) two times

Q33.The increasing order of the ionic radii of the given isoelectronic species is : (1) Cl−, Ca2+, K+, S2− (2) S2−, Cl−, Ca2+, K+ (3) Ca2+, K+, Cl−, S2− (4) K+, S2−, Ca2+, Cl−

Q33.Which of the following presents the correct order of second ionization enthalpies of C, N, O and F ? (1) F > O > N > C (2) O > N > F > C (3) C > N > O > F (4) O > F > N > C

Q34.In which of the following arrangements, the sequence is not strictly according to the property written against it? (1) CO2 < SiO2 < SnO2 < PbO2 : increasing (2) NH3 < PH3 < AsH3 < SbH3 : increasing basic oxidising power strength (3) HF < HCl < HBr < HI : increasing acid (4) B < C < O < N : increasing first ionisation strength enthalpy.

Q34.Which among the following elements has the highest first ionization enthalpy? (1) Nitrogen (2) Boron (3) Carbon (4) Oxygen

Q34.The molecule having smallest bond angle is : (1) NCl3 (2) AsCl3 (3) SbCl3 (4) PCl3

Q34.Which pair of elements with the given atomic numbers is expected to have similar properties? (1) 40,72 (2) 20,36 (3) 10,28 (4) 11,12

Q34.Among the following species which two have trigonal pyramidal shape? (I) NI3 (II) I−3 (III) SO2−3 (IV) NO−3 (1) I and III (2) III and IV (3) I and IV (4) II and III

Q35.Among the following, the species having the smallest bond is (1) NO− (2) NO+ (3) O2 (4) NO

Q35.The formation of molecular complex BF3 −NH3 results in a change in hybridization of boron (1) from sp2 to dsp2 (2) from sp2 to sp3 (3) from sp3 to sp2 (4) from sp3 to sp3d

Q35.In which of the following pairs the two species are not isostructural? (1) CO2−3 and NO−3 (2) PCl+4 and SiCl4 (3) PF5 and BrF5 (4) AlF3−6 and SF6

Q35.Which one of the following will react most vigorously with water? JEE Main 2012 (19 May Online) JEE Main Previous Year Paper (1) Li (2) K (3) Rb (4) Na

Q35.Dipole moment is shown by (1) 1,2-dichlorobenzene (2) trans 2, 3-dichloro-2-butene (3) 1,4-chlorobenzene (4) trans-1,2-dinitroethene

Q36.Among the following, the molecule with the lowest dipole moment is (1) CHCl3 (2) CH3Cl (3) CH2Cl2 (4) CCl4

Q36.Although CN− ion and N2 molecule are isoelectronic, yet N2 molecule is chemically inert because of (1) presence of more number of electrons in bonding (2) lone bond energy orbitals (3) absence of bond polarity (4) uneven electron distribution.

Q36.Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point? JEE Main 2012 (07 May Online) JEE Main Previous Year Paper (1) NaCl (2) KCl (3) LiCl (4) RbCl

Q36.The compressibility factor for a real gas at high pressure is : (1) 1 + RT/pb (2) 1 (3) 1 + pb/RT (4) 1 −pb/RT

Q36.The relationship among most probable velocity, average velocity and root mean square velocity is respectively (1) √2 : √3 : √8/π (2) √2 : √8/π : √3 (3) √8/π : √3 : √2 (4) √3 : √8/π : √2

Q37.For 1 mol of an ideal gas at a constant temperature T , the plot of (log P) against (log V ) is a ( P : Pressure, V : Volume) (1) Straight line parallel to x-axis. (2) Straight line with a negative slope. (3) Curve starting at origin. (4) Straight line passing through origin.

Q37.Among the following chloro-compound having the lowest dipole moment is (1) (2) (3) (4) Q38. α, v and u represent most probable velocity, average velocity and root mean square velocity respectively of a gas at a particular temperature. The correct order among the following is (1) u > v > α (2) v > u > α (3) α > u > v (4) u > α > v

Q37.The incorrect expression among the following is : (1) ΔGsystem = −T (2) In isothermal process wreversible = −nRT ln Vf ΔStotal Vi (3) ln K = ΔH0−TΔS0RT (4) K = e−ΔG0/RT

Q37.One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. ΔS for the process in JK−1 mol−1 is [ln 2 = 0.693 and R = 8.314, J/(molK)] (1) 6.76 (2) 5.76 (3) 10.76 (4) 8.03

Q37.Which of the following has the square planar structure? (1) XeF4 (2) NH+4 (3) BF−4 (4) CCl4

Q38.The entropy of a sample of a certain substance increases by 0.836 J K−1 on adding reversibly 0.3344 J of heat at constant temperature. The temperature of the sample is: (1) 2.5 K (2) 0.3 K (3) 0.016 K (4) 0.4 K

Q38.The equilibrium constant (Kc) for the reaction N2(g) + O2( g) →2NO(g) at temperature T is 4 × 10−4 . The value of Kc for the reaction, NO(g) →1/2 N2(g) + 1/2 O2(g) at the same temperature is : (1) 0.02 (2) 2.5 × 102 (3) 4 × 10−4 (4) 50.0