1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: In NH3, N is sp3 hybridised, but angle is found to be 107°. Reason: The decrease in bond angle is due to repulsion between the lone pair - bond pair.

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Q. Assertion : In $NH_3, N$ is $sp_3$ hybridised, but angle is found to be $107^{\circ}$.
Reason : The decrease in bond angle is due to repulsion between the lone pair - bond pair.

Chemical Bonding and Molecular Structure

Solution:

Both assertion and reason are true and reason is the correct explanation of assertion.
lone pair - lone pair repulsion $>$ lone pair - bond pair repulsion $>$ bond pair - bond pair repulsion. In the ammonia molecule, $NH _3$ there are three bond pairs and one lone pair. The three $N - H$ bond pairs are pushed closer because of the lone pair - bond pair repulsion, and $HNH$ bond angle gets reduced from $109^{\circ} 23^{\prime}$ (the tetrahedral angle) to $107^{\circ}$.