An aqueous solution of FeSO4, Al2(SO4)3 and chromium alum is heated with excess of Na2O2 and filtered. The material obtained are: | Qualitative and Quantitative Analysis — Chem-Mantra | Chem-Mantra

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Question

An aqueous solution of FeSO4, Al2(SO4)3 and chromium alum is heated with excess of Na2O2 and filtered. The material obtained are:

Answer: B

💡 Solution & Explanation

Fe2+ oxidizes to Fe(OH)3 (brown residue). Al3+ forms soluble [Al(OH)4]^-. Cr3+ oxidizes to CrO4^2- (yellow filtrate).

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