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 $-1$.
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