Analytical ChemistryHard

Question

An aqueous solution FeSO4.Al2(SO4)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 residue
C.a yellow filtrate and a brown residue
D.a green filtrate and a brown residue

Solution

Solution contains Fe2+, Al3+ and Cr3+ ions. In alkaline medium, H2O2 reacts with this solution giving brown PPt of Fe (OH)3. colourless soluble NaAlO2 and yellow coloured chromate ions.

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