The geometry of ammonia molecule can be best described as :

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nitrogen at one vertex of a regular tetrahedron, the other three vertices being occupied by three hydrogens

nitrogen at the centre of the tetrahedron, three of the vertices being occupied by three hydrogens

nitrogen at the centre of an equilateral triangle, three corners being occupied by three hydrogens

nitrogen at the junction of a T, three open ends being occupied by three hydrogens

answer is B.

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Detailed Solution

In N¨H3 central atom is nitrogen which is sp3 hybridized hence, it will be at the centre of tetrahedron with H-atoms at three vertices

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