1

IIT-JEE 2000

Subjective

+3

-0

Copper sulphate solution (250 mL) was electrolysed using platinum anode and a copper cathode. A constant current of 2mA was passed for 16 minutes. It was found that after electrolysis the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate in the solution to begin with.

2

IIT-JEE 2000

Subjective

+2

-0

The following electrochemical cell has been set up.

Pt(1) | Fe

E

If an ammeter is connected between the two platinum electrodes, predict the direction of flow of current. Will the current increase or decrease with time?

Pt(1) | Fe

^{3+}, Fe^{2+}(a = 1) | Ce^{4+}, Ce^{3+}(a=1) | Pt(2)E

^{o}(Fe^{3+}, Fe^{2+}) = 0.77 V; E^{o}(Ce^{4+}, Ce^{3+}) = 1.61 VIf an ammeter is connected between the two platinum electrodes, predict the direction of flow of current. Will the current increase or decrease with time?

3

IIT-JEE 1999

Subjective

+6

-0

A cell, Ag | Ag

^{+}|| Cu^{2+}| Cu, initially contains 1 M Ag^{+}and 1 M Cu^{2+}ions. Calculate the change in the cell potential after the passage of 9.65 A current for 1 h.4

IIT-JEE 1998

Subjective

+3

-0

Calculate the equilibrium constant for the reaction:

2Fe

2Fe

^{3+}+ 3I^{-}$$\leftrightharpoons$$ 2Fe^{2+}+ $$I_3^-$$. The standard reduction potentials in acidic conditions are 0.78 V and 0.54 V respectively for Fe^{3+}| Fe^{2+}and $$I_3^-$$ | I^{-}couples.Questions Asked from Electrochemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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