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In ammonium ion the covalency of nitrogen is

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answer is B.

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Detailed Solution

Covalency = 4

In case of⁺NH₄ ion 3-valency electrons are involved in covalent bond formation and one lone pair involves in co-ordinate covalent bond formation.

The combining capasity of N with respect to "H" is "4"

Covalency of "N" is "4"

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