Question

An aqueous solution `FeSO_(4).Al_(2)(SO_(4))_(3)` and chrome alum is heated with excess of `Na_(2)O_(2)` and fltered. The materials obtained are
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 1

Correct Answer - C
(c ) TIPS`//` FORMULAE`:` Chrome alum is `K_(2)SO_(4).Cr_(2)(SO_(4))_(3).24H_(2)O`. The filtrate is yellow due to `CrO_(4)^(2-)` ion and residue is brown due to `Fe(OH)_(3)`.