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Among $CaH_2,NH_3,NaH$ and $B_2 H_6$ which are covalent hydride ?

$(A)\;NH_3\;and \;B_2H_6 \\ (B)\;NaH\;and \;CaH_2 \\(C)\;NaH\;and\;NH_3 \\(D)\;CaH_2\;and\;B_2H_6 $

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A)
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Among these $NaH \;and \;CaH_2$ are ionic hydrides and $B_2H_6 \;and \; NH_3$ are covalent hydrides.
Hence A is the correct answer.
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