P W Which of the following hydride is covalent and polymeric :- (A)...

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Which of the following hydride is covalent and polymeric :-
(A) \( \mathrm{CaH}_{2} \)
(B) \( \mathrm{BeH}_{2} \)
(C) \( \mathrm{NaH} \)
(D) \( \mathrm{BaH}_{2} \)
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