Which statement is not true about potash alum ?

Which statement is not true about potash alum ?

  1. A

    Its empirical formula is KAlSO42.  12H2O

  2. B

    It is used in dyeing industries

  3. C

    Its aqueous solution is basic in nature

  4. D

    On heating it melts and loses its water of crystallization

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    Solution:

    Alum forms acidic solution on dissolution in water due to hydrolysis of Al3+ ions.

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