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Question

An aqueous solution of FeSO4Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are:
  1. a yellow filtrate and a green residue.
  2. a green filtrate and a brown residue.
  3. a yellow filtrate and a brown residue.
  4. a colorless filtrate and a green residue.

A
a colorless 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.
Solution
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Option (C) is correct.
The materials obtained are a yellow filtrate and a brown residue.
In the presence of peroxide, .chromium ions are oxidized to chromate ions which give a yellow filtrate. Ferric ions form brown precipitate of Fe(OH)3.

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