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Question

Covalent hydrides among CaH2, NH3, NaH and B2H6 are _____

A

NH3 and B2H6

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B

NaH and CaH2

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C

NaH and NH3

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D

CaH2 and B2H6

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Solution

The correct option is A

NH3 and B2H6


For covalent hydrides, H should bond with elements of electronegativity close to it.
NH3 is a covalent compound.
Na and Ca are highly electropositive.
Thus, B2H6 is also a covalent compound
(Remember that B is left of C which forms covalent bonds with H)

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