Which of the following is not true about potash alum?

  1. A

    Its ernpirical formula is KAlSO42.12H2O.

  2. B

    Its aqueous solution is basic.

  3. C

    It is used in dyeing industries.

  4. D

    All are correct.

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    Solution:

    KAlSO4212H2O is a molecular formula of potash alum.

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