Why there is no change in the structure of the NH3 molecule

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Solution

NH3 has a pyramidal shape. Here, the central atom N (nitrogen) has 3 bond pairs and one lone pair. Hence, it is sp3 hybridised.

It will have a tetrahedron shape but one of its ends will be occupied by a lone pair which does not contribute to the structure. Therefore, it looks like a pyramid.

Also, it will have a bond angle less than that of what a tetrahedron has. This is because the lone pair repels all the bond pairs this results in the reduction of bond angle.

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