First slide

Electrolysis

Question

Which one of the following aqueous solution when subjected to electrolysis using inert electrodes shows change in concentration without any change in composition.

Moderate

A

$aq . {CuCl}_{2}$
B

$aq . K_{2} {SO}_{4}$
C

$aq . {AgNO}_{3}$
D

$aq . NaCl$

Solution

$aq . K_{2} {SO}_{4}$
Discharge potential of $H_{2} O$ is lesser than $K^{+}$
$2 H_{2} O + 2 e^{-} \to H_{2} + 2 {OH}^{-}$
$H_{2}$ is liberated at cathode.
Discharge potential of $H_{2} O$ is lesser than ${SO}_{4}^{- 2}$
$2 H_{2} O \to O_{2} + 4 H^{+} + 4 e^{-}$
$O_{2}$ is liberated at anode
Left over is concentrated. $K_{2} {SO}_{4} Conc . ↑$ composition doesn’t change.

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