Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27] (A) [Co(H2O)6]2+ (B) [Fe(H2O)6]2+ (C) [Mn(H2O)6]2+ (D) [Cr(H2O)

Question

Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27]

(A) [Co(H2O)6]2+
(B) [Fe(H2O)6]2+
(C) [Mn(H2O)6]2+
(D) [Cr(H2O)6]2+

Prashant Kotian · Accepted Answer

Correct answer: A. Number of unpaired e– n(n 2) B.M.   [Co(H2O)6]2+ 3.87 [Fe(H2O)6]2+ 4.89 [Mn(H2O)6]2+ 5.92 [Cr(H2O)6]2+ 4.89 Least paramagnetic behaviour = [Co(H2O)6]2+

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