Assertion :In $N H_{3}$ , $N$ is $s p^{3}$ hybridised but bond angle is $107^{o}$ . Reason: Shape of $N H_{3}$ molecule is trigonal pyramidal.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$N H_{3}$ molecule has $3$ bond pairs and $1$ lone pair, that lone pair cause repulsion to the bond pairs, that is the reason bond angle reduced from $120^{\circ}$ to $107^{\circ}$ .
So the correct option is [B].

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Assertion :In NH3, N is sp3 hybridised but bond angle is 107o. Reason: Shape of NH3 molecule is trigonal pyramidal.

Assertion :In $N H_{3}$ , $N$ is $s p^{3}$ hybridised but bond angle is $107^{o}$ . Reason: Shape of $N H_{3}$ molecule is trigonal pyramidal.