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Q.

The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit the lowest paramagnetic behaviour?
 (Atomic no. Cr=24,Mn=25,Fe=26,Co=27 ). 

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a

CrH2O62+

b

CoH2O62+

c

MnH2O62+

d

FeH2O62+

answer is A.

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Detailed Solution

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∴Since Co2+ has lowest number of unpaired electrons hence lowest paramagnetic behaviour is shown by CoH2O62+

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