Assertion :Ammonia has trigonal planar molecular geometry.
Reason : Ammonia has a central nitrogen atom surrounded by three hydrogen atoms and one unshared electron pair.

Assertion and Reason are correct and Assertion is the correct explanation of Reason.

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Both the Assertion and Reason are correct and Reason is not the correct explanation of Assertion.

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Assertion is correct but Reason is not correct.

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Assertion is not correct but Reason is correct

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Both the Assertion and Reason are not correct.

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Solution

The correct option is D Assertion is not correct but Reason is correct
Nitrogen has 5 valence electrons.In ammonia, it shares 3 electrons with 3 hydrogen atoms to form 3 covalent bonds and it still have one lone pair of electrons left.
So nitrogen atom at the centre with 3 surrounding $H$ atoms and lone pair of electrons arrange themselves in trigonal pyramidal shape to minimize repulsion.

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Assertion :Ammonia has trigonal planar molecular geometry.Reason : Ammonia has a central nitrogen atom surrounded by three hydrogen atoms and one unshared electron pair.

Assertion :Ammonia has trigonal planar molecular geometry.
Reason : Ammonia has a central nitrogen atom surrounded by three hydrogen atoms and one unshared electron pair.