Question

Dilute hno3 on electrolysis liberate what on anode

Answer 1

Oxygen is liberated at anode on electrolysis of $HNO_3$

Explanation:

On electrolysis of dilute $HNO_3$, the following reaction occurs:

$HNO_3(aq)\rightarrow H^{+}(aq)+NO_3^-(aq)$

$H_2O(l)\rightarrow H^{+}(aq)+OH^-(aq)$

There are $H^{+}$ ,  $NO_3^{-}$ and $OH^-$ ions.

At cathode which is a negative terminal , cations will be reduced. At anode which is a positive terminal , anions will be oxidized.

At cathode:

$4H^{+}+4e^- \rightarrow 2H_2(g)$

So, hydrogen is produced.

At anode:

As dicharge potential of $OH^-$ is much lower than that of $NO_3^-$

$4OH^-\rightarrow 2H_2O+O_2+4e^-$

At anode $O_2$ is produced.

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