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Which of the following is diamagnetic?

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${[Cu (CN)_{4}]}^{2 -}$

${[{NiCl}_{4}]}^{2 -}$

${[Ni {({NH}_{3})}_{4}]}^{2 +}$

${[Zn {({NH}_{3})}_{4}]}^{2 +}$

answer is A.

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Detailed Solution

(A) Zn⁺²: 4s⁰3d¹⁰ -- completely filled configuration, diamagnetic.

(B) Cu⁺² : 4s⁰3d⁹ -- one unpaired e^- , paramagnetic.

(D) Ni⁺²: 4s⁰3d⁸ -- two unpaired e^-s, paramagnetic.

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