Fill in the Blanks (b) ammonium chloride and ammonioum hydroxide (c) sulphuric acid and sodium sulphate A (d) sodium chloride and sodium hydroxide. 1. The conjugate base of HSO, in aqueous solution is. 3. The pH of a 10 molar solution of HCl in water is (1981 - I Mark) (1982 - I Mark) Anelement which can exist as a positive ion in acidic sokution and also as a negative ion in basic solution is said to be (1984 - I Mark) For a given veversible reaction at a fixed temperature, equilibrium constants K, and K, are related by. (1994 - I Mark) A ten-fold increase in pressure on the reaction, N2 (8)+3H2(8)2NH3(g) atequilibrium results in. (b) -8 (d) between 6 and 7 (a) 8 (c) between 7 and 8 The oxidation of SO, by O, s0 SO, is an exothermic reaction. The yield of SO, will be maximum is (a) temperature is increased and pressure is kept constant (b) temperature is reduced and pressure is increased (c) both temperature and pressure are increased (d) both temperature and pressure are reduced 5. 2. 4. 3. (1981 - I Mark) 4. For the reaction: (1981 - I Mark) in K. (1996 - 1 Mark) H,(g) +1,(8)- 2HI(g) 5. la the reaction I"+1, lj. the Lewis acid is. the equilibrium constant K, changes with (a) total pressure (b) catalyst (c) the amounts of H, and I, present (d) temperature Of the given anions, the strongest Bronsted base is (1997-I Mark) B True/ False 1. Aluminium chloride (AICI,) is a Lewis acid because it can donate electrons. (1982 - 1 Mark) 6. (1981 -I Mark) Ifequilibrium constant for the ccaction A, +B, -2AB, is K, then for the backward reaction AB %A, +% B, the equilibrium constant is 1/K. When a liquid and its vapour are at equilibrium and the pressure is suddenly decreased, cooling occurs. 2. (a) ao (b) cio; (1984 - I Mark) 3. (e) ao; (d) ao; At 90C, pure water has [H,O'] 10 mole litre, What is the value of K, at 90C? (a) 106 (c) 10-14 8. (1984 - 1 Mark) 7. 4. Solubility of sodium hydroxide increases with increase in (1981 -I Mark) (b) 10-12 (d) 10 temperature. (1985 - % Mark) MCQS with One Correct Answer The precipitate of (1982 -I Mark) 1. CaF,(K-1.7 x 10-10) Molten sodium chloride conducts electricitry due to the presence of (a) free electrons (b) free ions (c) free molecules (d) atoms of sodium and chlorine An acidic buffer solution can be prepared by mixing the solutions of is obtained when equal volumes of the following are mixed (a) 10MC2++ 10MF (b) 10-MCa+ + 10MF (c) 10-MCa* + 100MF (d) 10-MCa+ + 10-MF A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phases have equal: (1981 -I Mark) 9. 2. (1984 - 1 Mark) (a) inter-molecular forces (b) potential energy (e) total energy (1981 -I Mark) (a) ammonium acetate and acetic acid (d) kinetic energy