d
Chlorodiaquatriamminecobalt \((III)\) chloride is \(\left[ CoCl \left( NH _3\right)_3\left( H _2 O \right)_2\right] Cl _2\). Since.Co has \(+3\) charge so 2 chloride ion will be out of the complex ion and 1 within the complex to satisfy primary valency.