Question

14. The correct formula of diammine dichlorodicyano chromate (III) is :
(A) (CrC12 (CN)2 (NH3)2]8+
(B) (CrCl2(CN)2(NH3)223-
(C) (CrCl2(CN)2(NH3)2]
(D) [CCI (CN)2(NH3)2]​

Answer 1

Answer:

none of these actual formula is C8CI2N2O2

Answer 2

The correct formula of diammine dichlorodicyano chromate (III) is $[CrCl_2(CN)_2(NH_3)_2]^-$

Explanation:

Rules for naming of the coordination compounds :

1. The charge of metal indicated with the Roman numerals and enclosed in the parenthesis after metal name.

2. The ligands are named in alphabetical order before the metal ion.

3.b Ligands that include a numerical prefix in the name use the prefixes bis for 2, tris for 3, or tetrakis for 4 to indicate their number.

4. If the complex ion is an anion, we drop the ending of the metal name and add –ate.

In the given coordination compound, Cr is the chromium metal, the ligands are chloro (Cl), cyano (CN), ammine $(NH_3)$.

The oxidation state of chromium is +3.

x+2(-1)+2(-1)=-1

x-4=-1

x=-1+4= 3

Thus the correct formula of diammine dichlorodicyano chromate (III) is $[CrCl_2(CN)_2(NH_3)_2]^-$

Learn more about naming of coordination compounds:

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