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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Critical Thinking Analytical

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    An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are [IIT 1996]

    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

    Correct Answer: C

    Solution :

    Yellow filtrate is due to chromate ions \[(CrO_{4}^{--})\] and green residue is due to \[Fe{{(OH)}_{2}}\].


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