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(B) $(i)$ The number of unpaired electrons in $[Cr(H_2O)_6]^{3+}$ is $3$.The magnetic moment $\mu = \sqrt{n(n+2)} = \sqrt{3(3+2)} = \sqrt{15} \approx

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$(ii)$

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(B) $(i)$ The number of unpaired electrons in $[Cr(H_2O)_6]^{3+}$ is $3$.The magnetic moment $\mu = \sqrt{n(n+2)} = \sqrt{3(3+2)} = \sqrt{15} \approx 3.87 \ BM$.$(ii)$ The number of unpaired electrons in $[Fe(H_2O)_6]^{2+}$ is $4$.The magnetic moment $\mu = \sqrt{4(4+2)} = \sqrt{24} \approx 4.90 \ BM$.$(iii)$ The number of unpaired electrons in $[Zn(H_2O)_6]^{2+}$ is $0$.Therefore,$[Fe(H_2O)_6]^{2+}$ has the highest magnetic moment value.

Amongst the following ions,which one has the highest magnetic moment value?
$(i)$ $[Cr(H_2O)_6]^{3+}$
$(ii)$ $[Fe(H_2O)_6]^{2+}$
$(iii)$ $[Zn(H_2O)_6]^{2+}$

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Amongst the following ions,which one has the highest magnetic moment value?$(i)$ $[Cr(H_2O)_6]^{3+}$$(ii)$ $[Fe(H_2O)_6]^{2+}$$(iii)$ $[Zn(H_2O)_6]^{2+}$