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Predict which of the following hydrides ...

Predict which of the following hydrides is a gas on a solid (a) HCI (b) NaH. Give your reason.

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(a) At room temperature, HCl is a calourless gas and the solution of HCl in water is called hydrochloric acid and it is in liquid state
(b) Sodium hydride NaH is an ionic compound and it is made of sodium cations `(Na^+)` and hydride `(H^-)` anion. It has the octahedral crystal structure. It is an alkali metal hydride.
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