The d -electron configurations of Cr ²⁺, Mn ²⁺, Fe ²⁺ and Co ²⁺ are d^4, d^5, d^6 and d^7 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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Correct answer: A. [ Co ( H ₂ O )₆ ]²⁺

array cc electronic & no. of unpaired configuration & electrons array Since Co ²⁺ has lowest no. of unpaired electrons hence lowest paramagnetic behaviour is shown by [ Co ( H ₂ O )₆ ]²⁺

The d -electron configurations of Cr ²⁺, Mn ²⁺, Fe ²⁺ and Co ²⁺ are d^4, d^5, d^6 and d^7 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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