Question

The ionic charges on chromate ion and dichromate ion respectively are ______.

Options

• -2, -2

• -3, -2

• -2, -4

• -4, -2

Answer 1

The ionic charges on chromate ion and dichromate ion respectively are -2, -2.

Explanation:

The ionic charges of chromate and dichromate ions are -2 and -2, respectively.

This can be predicted on the basis of the following structures:

Dichromate ion \[\ce{(Cr2O^{2-}_7)}\]

Chromate ion \[\ce{CrO^{2-}_4}\]