Q.

Which of the following species has/have five unpaired electrons?

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a

Cr

b

Cr3+

c

Mn2+

d

Fe3+

answer is C.

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Detailed Solution

Mn=1s2 2s2 2p6 3s2 3p6 4s2 3d5Mn+2=1s2 2s2 2p6 3s2 3p6 4s0 3d5 =5 unpaired electronsFe=1s2 2s2 2p6 3s2 3p6 4s2 3d6Fe+3 =1s2 2s2 2p6 3s2 3p6 4s0 3d5 =5 unpaired electrons
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