An aqueous solution of `FeSO_4.Al_2(SO_4)_3` and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are

Options

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

Answer

C

Explanation

In the presence of peroxide, chromium ions are oxidised to chromate ions which give an yellow filtrate. Ferric ions form brown precipitate of `Fe(OH)_3.`,