Question

7. When an alkali metal is reacted with hydrogen then
metallic hydride is formed, in this reaction
º(a) Hydrogen is oxidized
(b) Hydrogen is reduced
(C) Hydrogen is neither oxidized nor reduced
Hydrogen is oxidized as well as reduced​

Answer 1

Answer:

Hydrogen is reduced

Explanation:

Let M represents an alkali metal.

2M +H2 = > 2MH

MH  can be represented as M+ H-

In this reaction, conversion of hydrogen an be represented

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 M+  ions.