Which of the following is an ionic hydride?

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Question

(C) Ionic hydrides,also known as saline or salt-like hydrides,are formed by the reaction of dihydrogen with highly electropositive $s$-block elements

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$NaH$

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(C) Ionic hydrides,also known as saline or salt-like hydrides,are formed by the reaction of dihydrogen with highly electropositive $s$-block elements (alkali and alkaline earth metals).$NaH$ is an ionic hydride because it is formed by the reaction of sodium (an alkali metal) with hydrogen.$AlH_3$ and $BH_3$ are covalent polymeric hydrides,and $NH_3$ is a covalent molecular hydride.

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