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Q.

Arrange the following cyano complexes in decreasing order of their magnetic moment.

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a

Cr(CN)63−>Mn(CN)63−>Fe(CN)63−>Co(CN)63−

b

Mn(CN)63−>Cr(CN)63−>Fe(CN)63−>Co(CN)63−

c

Fe(CN)63−>Cr(CN)63−>Mn(CN)63−>Co(CN)63−

d

Co(CN)63−>Cr(CN)63−>Mn(CN)63−>Fe(CN)63−

answer is A.

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Detailed Solution

Cr(CN)63−    Cr3+ in strong ligand field =t2g3eg 0=3 unpaired electron Mn(CN)63−    Mn3+ in strong ligand field =t2g4eg0=2 unpaired electron Fe(CN)63−    Fe3+ in strong ligand field =t2g5eg0=1 unpaired electron Co(CN)63−    Co3+ in strong ligand field =t2g6eg0= Zero unpaired electron
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Arrange the following cyano complexes in decreasing order of their magnetic moment.