(a) Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution: {\Ag}^{+}( {\aq})+ {\e}^{-} \to {\Ag}( { s}) {\E}^{\circ}=+0.80 {\V} {\H}^{+}( {\aq})+ {\e}^{-} \to \frac{1}{2} {\H}_2( {\g}) {\E}^{\circ}=0.00 {\V} On the basis of their standard reduction electrode potential ( {\E}^{\circ}) values, which reaction is feasible at the cathode and why? (b) Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration?

CBSE Class 12 Chemistry 2015 Solved Paper - Question 7

CBSE Class 12 Chemistry 2015 Solved Paper

Question : 7 of 26

Marks: +1, -0

(a) Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution:

{\Ag}^{+}( {\aq})+ {\e}^{-} → {\Ag}( {\ s})

\; {\E}^{∘}=+0.80 {\V}

{\H}^{+}( {\aq})+ {\e}^{-} → \;{1}/{2} {\H}_2( {\g})

\; {\E}^{∘}=0.00 {\V}

On the basis of their standard reduction electrode potential

( {\E}^{∘})

values, which reaction is feasible at the cathode and why?
(b) Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration?

Solution:

(i)

{\Ag}^{+}

(aq)

+ {\e}^{-} → {\Ag}( {\ s})

Reaction with higher

{\E}^{∘}

value

\/ ∆ {\G}^{∘}

negative
(ii) Molar conductivity of a solution at infinite dilution or when concentration approaches zero
Number of ions per unit volume decreases

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