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Coordination Compounds
Question
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The d- electron configurations of Cr3+, Mn2+ , Fe2+, and Co2+ are d4 ,d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour?

(At. no. Cr = 24, Mn = 25, Fe =26, Co = 27) 

  • [Fe(H2O)6]2+

  • [Co(H2O)6]2+

  • [Cr(H2O)6]2+

  • [Mn(H2O)6]2+

Answer

B.

[Co(H2O)6]2+


Therefore, [Co(H2O)6]2+ has a minimum number of unpaired electrons and thus, minimum paramagnetic behaviour.

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(a)    [Co(en)2Cl(NO2)2]
(b)    K[Co(CN)(CO2)(NO)]
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