Aqueous solution of Ni 2 + contains [ Ni ( H 2 O ) 6 ] 2 + and its magnetic moment is 2.83 B.M. When ammonia is added in it, comment on the magnetic moment of solution

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Aqueous solution of Ni 2 + contains [ Ni ( H 2 ​ O ) 6 ​ ] 2 + and its magnetic moment is 2.83 B.M. When ammonia is added in it, comment on the magnetic moment of solution

TestHub · Accepted Answer

Ni²⁺ has a d⁸ electronic configuration, which forms an octahedral complex with six ligands.

In an octahedral crystal field, d⁸ systems always have the electron distribution $t_{2 g}^{6} e_{g}^{2}$ .

This configuration remains identical for both weak-field ligands (H₂O) and strong-field ligands (NH₃). Consequently, the number of unpaired electrons stays at $n = 2$ in both complexes.

Since the number of unpaired electrons is unchanged, the magnetic moment ( $μ = n (n + 2) = 2.83 B . M .$ ) remains the same.

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