1
IIT-JEE 1992
Subjective
+3
-0
An aqueous solution of NaCl on electrolysis gives H2(g), Cl2(g) and NaOH according to the reaction:
2Cl- (aq) + 2H2O = 2OH- (aq) + H2 (g) + Cl2 (g)
A direct current of 25 amperes with a current efficiency of 62 % is passed through 20 litres of NaCl solution (20% by weight). Write down the reactions taking place at the anode and cathode. How long will it take to produce 1kg of Cl2? What will be the molarity of the solution with respect to hydroxide ion? (Assume no loss due to evaporation)
2
IIT-JEE 1991
Subjective
+2
-0
Zinc granules are added in excess to a 500 ml. of 1.0 M nickel nitrate solution at 25oC until the equilibrium is reached. If the standard reduction potential of Zn2+ | Zn and Ni2+ | Ni are -0.75 V and -0.24 V respectively, find out the concentration of Ni2+ in solution at equilibrium.
3
IIT-JEE 1991
Subjective
+4
-0
The current of 1.70 A is passed through 300.0 ml of 0.160 M solution of a ZnSO4 for 230 sec. with a current efficiency of 90%. Find out the molarity of Zn2+ after the deposition of Zn. Assume the volume of the solution to remain constant during electrolysis.
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