Identify correct pair of properties of [Co(NH_3)_6]^ 3+ complex ion

MHT CET 2022 Chemistry question

Identify correct pair of properties of complex ion

(A)Low spin, diamagneticCorrect
(B)High spin, paramagnetic
(C)High spin, diamagnetic
(D)Low spin, paramagnetic

Answer: (A)

Solution

In the oxidation state of Co is +3, so the configuration is . is a strong-field ligand, so the pairing energy is lower than the crystal-field splitting; the six d electrons pair up completely in the orbitals (), leaving

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Question ID VK-093818