Which of the following hydride is non-stoichiometric in nature ?

Ammonia

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Diborane

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Sodium hydride

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Nickel hydride.

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Solution

The correct option is D Nickel hydride.
Interstitial hydrides are also known as metallic hydrides. They are formed when hydrogen molecule react with d and f block metals. These hydrides are non-stoichiometric in nature since a fraction of hydrogen atom are not fixed to the metal. Nickel hydride is an example of interstitial hydride and it is non-stoichiometric in nature.
Ionic and covalent hydrides are stoichiometric nature.
Sodium hydride $(N a H)$ is ionic hydride.
Ammonia $(N H_{3})$ and Diborane $(B_{2} H_{6})$ are covalent hydride.
Hence option (d) is correct

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Binary Compounds - Hydrides

Standard XII Chemistry

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