Question

Why do aqueous solutions of `Cr^(2+)` usually appear violet instead of blue?

Answer 1

There MAY have been due to the oxidation of the chromous salt.

Explanation:

`[Cr(OH_2)_6]^(2+)` as far as I know is a beautiful blue salt. In solution, partial oxidation to `[Cr(OH_2)_6]^(3+)` occurs which is red-violet in colour. So the colour you see is the result of `Cr^(2+)(aq)` and `Cr^(3+)(aq)` ions..........