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