An aqueous solution of FeSO4, Al2SO43 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are

An aqueous solution of FeSO4, Al2SO43 and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are

  1. A

    a colourless filtrate and a green residue.

  2. B

    a yellow filtrate and a green residue.

  3. C

    a yellow filtrate and a brown residue.

  4. D

    a green filtrate and a brown residue.

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    Solution:

    The yellow filtrate is sodium chromate and the yellow is due to CrO42 ion. This filtrate is obtained when Cr (III) oxidizes in the presence of sodium peroxide. Brown residue corresponds to Fe(OH)3.

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