Co-Ordination Compounds Question 280

Question: 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).

Options:

A) [Co(H2O)6]2+

B) [Cr(H2O)6]2+

C) [Mn(H2O)6]2+

D) [Fe(H2O)6]2+

Show Answer

Answer:

Correct Answer: A

Solution:

Electronic configuration No. of unpaired electrons
Co2+ d7
Cr2+ d4
Mn2+ d5
Fe2+ d6

Since Co2+ has lowest no.

of unpaired electrons hence lowest paramagnetic behaviour is shown by [Co(H2O)6]2+



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