1

IIT-JEE 2001

Subjective

+10

-0

The standard potential of the following cell is 0.23V at 15

Pt | H

(i) Write the cell reaction.

(ii) Calculate $$\Delta H^o$$ and $$\Delta S^o$$m for the cell reaction by assuming that these quantities remain unchanged in the range 15

(iii) Calculate the solubility of AgCl in water at 25

^{o}C and 0.21 V at 35^{o}C.Pt | H

_{2}(g) | HCl (aq) | AgCl (s) | Ag (s)(i) Write the cell reaction.

(ii) Calculate $$\Delta H^o$$ and $$\Delta S^o$$m for the cell reaction by assuming that these quantities remain unchanged in the range 15

^{o}C to 35^{o}C.(iii) Calculate the solubility of AgCl in water at 25

^{o}C**Given :**The standard reduction potential of the Ag^{+}(aq) / Ag (s) couple is 0.80 V at 25^{o}C2

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.

3

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?

4

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.Questions Asked from Electrochemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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