1

IIT-JEE 1993

Subjective

+2

-0

Chromium metal can be plated out from an acidic solution containing CrO

CrO

Calculate (i) how many grams of chromium will be plated out by 24,000 coulombs and (ii) how long will it take to plate out 1.5 g of chromium by using 12.5 amp current.

_{3}according to the following equationCrO

_{3}(aq) + 6H^{+}(aq) + 6e^{-}$$\to$$ Cr(s) + 3H_{2}OCalculate (i) how many grams of chromium will be plated out by 24,000 coulombs and (ii) how long will it take to plate out 1.5 g of chromium by using 12.5 amp current.

2

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}]3

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)4

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.Questions Asked from Electrochemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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