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Aqueous solution of Ni²⁺ contains ${[Ni {(H_{2} O)}_{6}]}^{2 +}$ and its magnetic moment is 2.83 BM.When ammonia is added in it, comment on the magnetic moment of solution :

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It cannot be predicted theoretically

It increases from 2.83 BM.

It will remain same

It decreases from 2.83 BM.

answer is A.

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Detailed Solution

${[Ni {(H_{2} O)}_{6}]}^{2 +} + 6 {NH}_{2} ⇌ {[Ni {({NH}_{3})}_{6}]}^{2 +} + 6 H_{2} O {sp}^{3} d^{2} Hyb. {sp}^{3} d^{2} Hyb μ_{eff} = 2 .8 BM μ_{eff} = 2 .8 BM$

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