Question

Determine the chemical formula for the compound, potassiumtrisethylenediamine chromate(III).

A) K3[Cr(NH2CH2CH2NH2)3]
B) [K(NH2CH2CH2NH2)3]Cr3+
C) [KCr(NH2CH2CH2NH2)3]3+
D) K2[Cr(NH2CH2CH2NH2)4]
E) [Cr(NH2CH2CH2NH2)2]K2

Answer 1

Answer: The correct answer is (A).

Explanation:

Potassium-trisethylene-diamine chromate(III)

Potassium is coming first in name which means that potassium is present as cation.

In the complex, 3 molecules of 'ethylene-diamine' is present as an dianion and forms a complex with Chromium (III) metal, making the overall charge on the coordination sphere as (-3).

So, to make a neutral complex, 3 potassium ions are required.

Hence, the structure of the complex is $K_3[Cr(NH_2CH_2CH_2NH_2)_3]$