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Complex Spin only magnetic moment
I) ${[F e {(C N)}_{6}]}^{3 -}$ A) 1.732 B.M
II) ${[M n {(C N)}_{6}]}^{3 -}$ B) 2.82 B.M
III) ${[C r {(H_{2} O)}_{6}]}^{3 +}$ C) 3.87 B.M
IV) ${[F e F_{6}]}^{4 -}$ D) 4.9 B.M
Correct match is
I II III IV
1 D B A C
2 A B C D
3 B A D C
4 C D B A

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answer is B.

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Detailed Solution

${[F e {(C N)}_{6}]}^{3 -}$ --Fe⁺³ --t_2g⁵eg⁰	1.732 B.M
${[M n {(C N)}_{6}]}^{3 -}$ --Mn⁺³--t_2g⁴eg⁰	2.82 B.M
${[C r {(H_{2} O)}_{6}]}^{3 +}$ ---Cr⁺³----t_2g³eg⁰	3.87 B.M
${[F e F_{6}]}^{4 -}$ --Fe⁺² --t_2g⁴eg²	4.9 B.M

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