Question

The correct formula of diammine dichlorodicyano chromate (III) is :

• A. $\left[CrC{l}_2\right(CN{)}_2(N{H}_3{)}_2{]}^{3+}$
• B. $\left[CrC{l}_2\right(CN{)}_2(N{H}_3{)}_2{]}^{3-}$
• C. $\left[CrC{l}_2\right(CN{)}_2\left(N{H}_3{)}_2\right]$
• D. $\left[CrC{l}_2\right(CN{)}_2(N{H}_3{)}_2{]}^{-}$

Answer 1

The correct option is D $\left[CrC{l}_2\right(CN{)}_2(N{H}_3{)}_2{]}^{-}$

The correct formula of diammine dichlorodicyano chromate (III) is $\left[CrC{l}_2\right(CN{)}_2(N{H}_3{)}_2{]}^{-}$. 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.

Option D is the correct answer.