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Ionic hydrides are formed by :

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Elements of very low electropositivity

Elements of very high electropositivity

Transition metals

metalloids

answer is B.

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Detailed Solution

Ionic hydrides are formed by elements of very high electro positivity.

Alkali and alkaline earth metals, which are electromotive with regard to hydrogen, produce ionic hydrides (except Be and Mg). They entail the formation of the hydride ion by an electron transfer from metal, to $H^{-}$ .

Hence, the correct option is B.

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