Subjective Type

Arrange the following in order of increasing reducing property. NaH, MgH2 and H2O

Solution

$$NaH$$ is an ionic hydride and can easily donate its electrons. It is the most reducing.

$$\displaystyle MgH_2 $$ and $$\displaystyle H_2O $$ are covalent hydrides. $$\displaystyle H_2O $$ has lower reducing power than $$\displaystyle MgH_2 $$ as it's bond dissociation energy is higher.

Hence, the increasing order of the reducing property is $$\displaystyle H_2O < MgH_2 < NaH $$.

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