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An aqaeoussolutionof FeSO_(4).Al_(2)(SO_(4))_(2) and chrome alum is heated with excess of Na_(2)O_(3) and chrome alumin heatedwith excess of Na_(2)O_(2) and fiterad .The matrialsobtained are

Answer»

A colourless fitrateand a GREEN residue
A yellow fitrateand a green residue
A yellow fitrateand a brown residue
A green fitrateand a green brown

Solution :In the presence of peroxide, chromium IONS are oxidisedto chromate ions which GIVE a yellowfitrate ferrie ions form brownprecipitate of `FE(OH)_(3)`


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