Covalent hydrides among $C a H_{2}, N H_{3}, N a H a n d B_{2} H_{6}$ are _____

N H_{3} a n d B_{2} H_{6}

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N a H a n d C a H_{2}

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N a H a n d N H_{3}

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C a H_{2} a n d B_{2} H_{6}

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Solution

The correct option is A $N H_{3} a n d B_{2} H_{6}$
For covalent hydrides, H should bond with elements of electronegativity close to it.
$N H_{3}$ is a covalent compound.
Na and Ca are highly electropositive.
Thus, $B_{2} H_{6}$ is also a covalent compound
(Remember that B is left of C which forms covalent bonds with H)

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