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Q.

Pick out the correct statement with respect to [Mn(CN)6]3-

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a

It is sp3 d2 hybridised and tetrahedral.

b

It is d2sp3 hybridised and octahedral.

c

It is dsp2 hybridised and square planar.

d

It is sp3 d2 hybridised and octahedral.

answer is B.

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Detailed Solution

Mn(CN)63-  Let oxidation state of Mn be x .  x+6×(-1)=-3x=+3  Electronic configuration of Mn:[Ar]4s23d5  Electronic configuration of Mn3+:[Ar]3d4 CN-is a strong field ligand thus, it causes pairing of   electrons in 3d -orbital.     Thus, Mn(CN)63- has d2sp3 hybridisation and has octahedral geometry.
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Pick out the correct statement with respect to [Mn(CN)6]3-