Identify the correct statement for the following reaction:
$3 \ Mg + N_2 \longrightarrow Mg_3N_2$

$Zn^{2+}_{(aq)} + 2e^- \to Zn_{(s)}$. This is

Observe the following reactions:
$I$. $2H_2O_{(l)} + 2Na_{(s)} \rightarrow 2NaOH_{(aq)} + H_{2(g)}$
$II$. $2H_2O_{(l)} + 2F_{2(g)} \rightarrow 4H^{+}_{(aq)} + 4F^{-}_{(aq)} + O_{2(g)}$
Identify the correct statement from the following:

When $Zn$ is added to $CuSO_4$ solution,$Cu$ is obtained. This is due to:

When an acidified solution of ferrous ammonium sulphate is treated with potassium permanganate solution,the ion which is oxidised is

The conversion of sugar $C_{12}H_{22}O_{11} \to CO_2$ is