Hybridisation of the central atom is affected when

N H_{3}

changes to

N H_{4}^{+}

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A l H_{3}

changes to

A l H_{4}^{-}

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in both the cases

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in none of the case

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Solution

The correct option is B $A l H_{3}$ changes to $A l H_{4}^{-}$
$A l H_{3}$ is $s p^{2}$ hybridised. It has 3 bond pairs.
$A l H_{4}^{-}$ has 4 bond pairs making it $s p^{3}$ hybridised.

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