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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

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a colourless filtrate and a green residue.

a yellow filtrate and a green residue.

a yellow filtrate and a brown residue.

a green filtrate and a brown residue.

answer is C.

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Detailed Solution

The yellow filtrate is sodium chromate and the yellow is due to ${CrO}_{4}^{2 -}$ 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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