1

IIT-JEE 1991

Subjective

+2

-0

Zinc granules are added in excess to a 500 ml. of 1.0 M nickel nitrate solution at 25

^{o}C until the equilibrium is reached. If the standard reduction potential of Zn^{2+}| Zn and Ni^{2+}| Ni are -0.75 V and -0.24 V respectively, find out the concentration of Ni^{2+}in solution at equilibrium.2

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 ZnSO

_{4}for 230 sec. with a current efficiency of 90%. Find out the molarity of Zn^{2+}after the deposition of Zn. Assume the volume of the solution to remain constant during electrolysis.3

IIT-JEE 1987

Subjective

+5

-0

**(i)**What is the weight of sodium bromate and molarity pf solution necessary to prepare 85.5 ml of 0.672 B solution when the half-cell reaction is

$$BrO_3^- + 6H^+ + 6e^- \to $$ $$Br^- + 3H_2O$$

**(ii)**What would be the weight as well as molarity if the half-cell reaction is:

$$2BrO_3^- + 12H^+ + 10e^- \to$$ $$Br_2 \,+ 6H_2O$$

Questions Asked from Electrochemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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