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Question

Which of the following has magnetic moment of 1.73 B.M. (approx.)?

A
[CoCl6]4
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B
[Fe(CN)6]3
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C
[Cu(NH3)4]2+
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D
[Ni(CO)4]
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Solution

The correct option is C [Cu(NH3)4]2+
[Cu(NH3)4]2+ has one unpaired electron. Therefore, its magnetic moment,
μ=n(n+2)=1(1+2)=3
= 1.73 B.M

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