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An aqueous solution `FeSO_4 . Al_2 (SO_4)_3` and chrome alumn is heated with excess of `Na_2 O_2` and filtered. The materials obtained are
A. A coloureless 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.

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Yellow filtrate contains `CrO_(4)^(2-)` ion and green ppt. is of `Fe(OH)_(2)`

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