• question_answer 2) Justify that the reaction : $2Na(s)+{{H}_{2}}(g)\to 2NaH(s)$is a redox change.

$2Na(s)+{{H}_{2}}(g)\to 2Na{{\,}^{+}}{{\text{H}}^{\text{-}}}$ It is a redox change in which sodium is oxidised while hydrogen is reduced because an electron is transferred from sodium to hydrogen.

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