First slide

Electrolysis

Question

When very dilute solution of sodium hydroxide is electrolysed using platinum electrodes, then

Moderate

A

hydrogen is evolved at cathode
B

hydrogen is evolved at anode
C

sodium is obtained at cathode
D

oxygen is produced at anode

Solution

$NaOH ⟶ {Na}^{+} + {OH}^{-}$
At anode - $2 H_{2} O ⟶ O_{2} + 4 H^{+} + 4 e^{-}$
At cathode - $H^{+} + e^{-} ⟶ \frac{1}{2} H_{2}$

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