Justify that the reaction : $$ 2Na(s) + H_2(g) \rightarrow 2NaH $$ is redox reaction.
In this reaction, $$ Na $$ is oxidised to $$ Na^+ $$ and hydrogen is reduced from $$ H2 $$ and $$ H- ion.$$ Therefore it is a redox reaction.
$$ 2Na^0 + H2^0 \rightarrow 2Na^+ H^{-1} (s) $$