Which of the following statement(s) is/are correct?

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${[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co (CN)_{6}]}^{3 -}$ and ${[Co {({NO}_{2})}_{6}]}^{3 -}$ diamagnetic involving $d^{2} {sp}^{3}$ hybridisation.

${[Zn {({NH}_{3})}_{4}]}^{2 +}, {[{FeCl}_{4}]}^{-}$ and $[Ni (CO)_{4}]$ are diamagnetic involving ${sp}^{3}$ hybridization.

The magnetic moment of ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ is 5.92 BM. and that of ${[Fe (CN)_{6}]}^{3 -}$ is 1. 73 B.M.

The magnetic moment of $K_{4} [{MnF}_{6}]$ and $K_{3} [{FeF}_{6}]$ are same.

answer is A.

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Detailed Solution

${[Zn {({NH}_{3})}_{4}]}^{2 +}, {[{FeCl}_{4}]}^{-}$ and $[Ni (CO)_{4}]$ are diamagnetic involving ${sp}^{3}$ hybridization because ${[{FeCl}_{4}]}^{-}$ is paramagnetic .

When exposed to a magnetic field, paramagnetic materials are only weakly drawn to it; once the external field is removed, the materials lose their magnetic qualities.

Hence, options A, C and D are correct.

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