1

IIT-JEE 1992

Subjective

+4

-0

For the galvanic cell

Ag | AgCl(s), KCl (0.2M) || KBr (0.001M), AgBr(s) | Ag

Calculate the EMF generated and assign correct polarity to each electrode for a spontaneous process after taking into account the cell reaction at 25

[K

Ag | AgCl(s), KCl (0.2M) || KBr (0.001M), AgBr(s) | Ag

Calculate the EMF generated and assign correct polarity to each electrode for a spontaneous process after taking into account the cell reaction at 25

^{o}C.[K

_{sp}(AgCl) = 2.8 $$times$$ 10^{-10}; K_{sp}(AgBr) = 3.3 $$times$$ 10^{-13}]2

IIT-JEE 1992

Subjective

+3

-0

An aqueous solution of NaCl on electrolysis gives H

2Cl

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 Cl

_{2}(g), Cl_{2}(g) and NaOH according to the reaction:2Cl

^{-}(aq) + 2H_{2}O = 2OH^{-}(aq) + H_{2}(g) + Cl_{2}(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 Cl

_{2}? What will be the molarity of the solution with respect to hydroxide ion? (Assume no loss due to evaporation)3

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.4

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.Questions Asked from Electrochemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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