Appeared in: 2026 (2 sets)
Which of the following is heteroleptic complex ?
(A) $[\text{Co}(\text{NH}_3)_6]^{3+}$
(B) $[\text{Cr}(\text{NH}_3)_6]^{3+}$
(C) $[\text{Ni}(\text{H}_2\text{O})_6]^{2+}$
(D) $[\text{Co}(\text{NH}_3)_4\text{Cl}_2]^+$