First slide

Activity Series (OR) Electro chemicals series

Question

Aqueous solution of ‘X’ is electrolyzed using inert electrodes. Hydrogen is liberated at cathode and oxygen is liberated at anode. ‘X’ is

Moderate

A

aq. NaCl
B

aq. Cu ${Cl}_{2}$
C

aq. ${AgNO}_{2}$
D

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

Solution

At cathode, discharge potential of $H_{2} O$ is greater than that of $K^{+}$
$∴ 2 H_{2} O + 2 e^{-} \to H_{2} + 2 {OH}^{-}$
At anode, discharge potential of $H_{2} O$ is greater than that of ${SO}_{4}^{- 2}$
$∴ 2 H_{2} O \to 4 H^{+} + 4 e^{-} + O_{2}$

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