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

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Ammonia is consered a strong ligand generally, but in reality, strength of a ligand depends on the metal it is interacting with. As it stands, NH₃isn't a strong enough ligand to cause pairing up in Ni, hence the magnetic moment remains the same.

${[Ni {(H_{2} O)}_{6}]}^{2 +} + 6 {NH}_{3} \to {[Ni {({NH}_{3})}_{6}]}^{2 +} + 6 H_{2} O$

${sp}^{3} d^{2} Hybridisation$ ${sp}^{3} d^{2} Hybridisation$
$μ = 2.8 BM$ $μ = 2.8 BM$

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