Q. 274.0( 3 Votes )

# Magnetic moment of [MnCl4]2– is 5.92 BM. Explain giving reason.

Answer :

A magnetic moment of 5.92 BM means there are 5 unpaired electrons because

Magnetic Moment = √ n(n+2)

There are four ligands attached to Mn^{2+} so the geometry has to be either square planar(dsp^{2}) or tetrahedral(sp^{3}). It can’t be square planar because all the five d orbitals in Mn^{2+} are singly filled and not vacant. So, this means the geometry is tetrahedral with 5 unpaired electrons giving a magnetic moment of 5.92 BM.

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PREVIOUSA complex of the type [M(AA)2X2]n+is known to be optically active. What does this indicate about the structure of the complex? Give one example of such complex.NEXTOn the basis of crystal field theory explain why Co(III) forms paramagnetic octahedral complex with weak field ligands whereas it forms diamagnetic octahedral complex with strong field ligands.

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