Chemistry

Problem

An aqueous solution of

\text{FeSO}_4 \cdot \text{Al}_2(\text{SO}_4)_3

and chromium alum is heated with excess of

\text{Na}_2\text{O}_2

and filtered. The material obtained are: a. a colourless filtrate and green residue b. a yellow filtrate and brown residue c. a yellow filtrate and a green residue d. a green filtrate and a brown residue

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