An aqueous solution of `FeSO_(4),Al_(2)(SO_(4))_(3)` and chrome alum is heated with excess of `Na_(2)O_(3)` and filtered. The material obtained are `:`

Options

A. a colourless filtrate and a green residue.
B. a yellow filtrate and a green residue.
C. a yellow filtrate and a brown residue
D. a green filtrate and a brown residue.

Answer

C

Explanation

The filtrate is yellow due to `CrO_(4)^(2-)` ion and residue is brown due to `Fe(OH)_(3)`.