IIT-JEE-Chemistry-Final Revision Set No.68

1. In the electrolytic cell, flow of electrons is from :
(a) cathode to anode in solution
(b) cathode to anode through external supply
(c) cathode to anode through internal supply
(d) anode to cathode through internal supply
2. In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 is 2 × 10⁴ sec. The rate constant of reaction in sec-1 is :
(a) 2 × 10⁴
(b) 3.45 × 10^-5
(c) 1.386 × 10^-5
(d) 2 × 10^-4

3. During depression of freezing point in a solution the following are in equilibrium :
(a) liquid solvent, solid solvent
(b) liquid solvent, solid solute
(c) liquid solute, solid solute
(d) liquid solute solid solvent

4. H3BO3 is :
(a) Monobasic and weak Lewis acid
(b) Monobasic and weak Bronsted acid
(c) Monobasic and strong Lewis acid
(d) Tribasic and weak Bronsted acid

5. ²³Na is the more stable isotope of Na. Find out the process by which ²⁴Na can undergo radioactive decay:
(a) b- emission
(b) a emission
(c) b+ emission
(d) K electron capture


Screening JEE 2003