Question

# When an alkali metal is reacted with hydrogen then metallic hydride is formed. In this reaction:

A
hydrogen is oxidized
B
hydrogen is reduced
C
hydrogen is neither oxidised nor reduced
D
hydrogen is oxidized as well as reduced

Solution

## The correct option is B hydrogen is reducedLet M represents an alkali metal.$$\displaystyle 2M+H_2 \to 2MH$$$$\displaystyle MH$$ can be represented as $$\displaystyle M^++H^-$$In this reaction, conversion of hydrogen an be represented as $$\displaystyle H_2 +2e^- \to 2H^-$$Thus, a molecule of hydrogen accepts a pair of electrons to form 2 hydride ions. Gain of electrons is reduction. Hence, hydrogen is reduced to hydride ions.Note: Alkali metal is oxidised to $$\displaystyle M^+$$ ions.Chemistry

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