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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2003

  • question_answer
    In Lake test of \[A{{l}^{3+}}\] ion, there is formation of coloured floating-lake. It is due to

    A)  adsorption of litmus by \[{{H}_{2}}O\]

    B)         adsorption of litmus by \[Al{{(OH)}_{3}}\]

    C)         adsorption of litmus by \[Al{{(OH)}_{4}}\]

    D)         none of the above.

    Correct Answer: B

    Solution :

    In Lake test of \[A{{l}^{3+}}\] ion, there is formation of coloured floating lake. It is due to the fact that \[Al{{(OH)}_{3}},\] a solid surface (suspension) absorbed litmus colour hence appears as coloured floating lake.


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