Question

addition of the hydrogen in a substance in reaction is known as dash reaction​

Answer 1

it is known as

reduction

Answer 2

Addition of the hydrogen in a substance in a reaction is known as reduction reaction​

Explanation:

Oxidation reaction is defined as the reaction in which a substance gains oxygen , lose hydrogen or looses its electrons.

$2Mg+O_2\rightarrow 2MgO$, Here Magnesium is getting oxidised.

Reduction reaction is defined as the reaction in which a substance lose oxygen , gain hydrogen or gains electrons.

$\frac{1}{2}O_2+H_2\rightarrow H_2O$ , here oxygen is getting reduced.

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