1. Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25°C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at the same temperature will be:
(Molecular mass of CHCl3 = 119.5 u and molecular mass of CH2Cl2 = 85 u)
(1) 285.5 mm Hg (2) 173.9 mm Hg
(3) 615.0 mm Hg (4) 347.9 mm Hg
2. The Gibbs energy for the decomposition of Al2O3 at 500°C is as follows:
2/3 Al2O3 → 4/3 Al + O2 ; ΔrG = + 960kJ mol-1
The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at 500°C at least
(1) 5.0 V (2) 4.5 V
(3) 3.0 V (4) 2.5 V
3. Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (EM2+ /M)value has a positive sign?
(1) Fe (Z = 26) (2) Co (Z = 27)
(3) Ni (Z = 28) (4) Cu (Z = 29)
4. Which of the following exhibits only +3 oxidation state?
(1) Pa (2) U
(3) Th (4) Ac
5. Molar conductivities (˄m0) at infinite dilution of NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol–1 respectively. ˄m0 for CH3COOH will be:
(1) 390.5 S cm2 mol–1 (2) 425.5 S cm2 mol–1
(3) 180.5 S cm2 mol–1 (4) 290.8 S cm2 mol–1
6. In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
(1) CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
(2) HF < HCl < HBr < HI : increasing acidic strength
(3) H2O < H2S < H2Se < H2Te : increasing pKa values
(4) NH3 < PH3 < AsH3 < SbH3 : increasing acidic character
8. During change of O2 to O2– ion, the electron adds on which one of the following orbitals?
(1) σ orbital (2) π* orbital (3) π orbital (4) σ* orbital
9. Standard reduction potentials of the half reactions are given below:
F2(g) + 2e– → 2F– (aq); E0 = +2.85V
Cl2(g) + 2e– → 2Cl– (aq); E0 = +1.36 V
Br2(g) + 2e– → 2Br– (aq); E0 = +1.06 V
I2(g) + 2e– → 2I– (aq) ; E0 = +0.53 V
The strongest oxidising and reducing agents respectively are:
(1) Cl2 and I2 (2) F2 and I–
(3) Br2 and Cl– (4) Cl2 and Br–
10. The catalytic activity of transition metals and their compounds is ascribed mainly to
(1) their chemical reactivity
(2) their magnetic behaviour
(3) their unfilled d-orbitals
(4) their ability to adopt variable oxidation states
11. Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (Cp/Cv) of the mixture will be
(1) 1.67 (2) 0.83
(3) 1.50 (4) 3.3
12. Given that the equilibrium constant for the reaction
2SO2 (g) + O2 (g) ⇌ 2SO3(g)
has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature.
2SO3 (g) ⇌ 1/2 O2 (g) 2SO2(g)
(1) 1.3 × 10–5 (2) 1.8 × 10–3
(3) 3.6 × 10–3 (4) 6.0 × 10–2
13. Which one of the following sets forms the Bidegradable polymer?
(a) 
(b) 
(c) 
(d) 
14.
(1) Li (2) Na (3) K (4) Rb
15. Activation energy (Ea) and rate constants (k1 and k2) of a chemical reaction of two different temperatures (T1 and T2) are related by:
(a) 
(b) 
(c) 
(d) 