Assertion (A) : The dative bond is present in ammonium ion.
Reason (R ) : For the formation of dative bond between ammonia and hydrogen ion, nitrogen contributes two electrons.

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Both A and R are correct and R is not the correct explanation of A.

A is incorrect, R is correct

Both A and R are correct and R is the correct explanation of A

A is correct, R is incorrect

answer is A.

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Detailed Solution

Between two atoms one atom donate electron pair another atom accept electron pair to form dative bond. In ammonium ion dative bond is formed between ammonia and hydrogen ion. In ammonia nitrogen atom donate a pair of electrons to hydrogen ion.

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