d
The correct formula of diammine dichlorodicyano chromate \((III)\) is \(\left[ CrCl _2( CN )_2\left( NH _3\right)_2\right]^{-}\). It contains two ammines, two cyano, and two chloro ligands. The oxidation state of chromium is \(III\).Hence, the overall charge on the anion is \(-1\).