Chemistry

Problem

Column-I (Pair of complexes)	Column-II (Property which is similar in given pair)
(A) $[\text{Fe}(\text{CN})_6]^{3-}$ and $[\text{Co}(\text{NH}_3)_6]^{2+}$	(P) Magnetic moment
(B) $[\text{Fe}(\text{H}_2\text{O})_6]^{2+}$ and $[\text{Fe}(\text{CN})_6]^{4-}$	(Q) Geometry
(C) $[\text{Ni}(\text{CN})_4]^{4-}$ and $[\text{Ni}(\text{CO})_4]$	(R) Hybridisation
(D) $[\text{Ni}(\text{H}_2\text{O})_6]^{2+}$ and $[\text{NiCl}_4]^{2-}$	(S) Number of $d$ -electrons