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Which of the following is not true about potash Alum

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Which of the following is not true about potash Alum

(a)   It’s empirical formula is KAl(SO4)2 . 12H2O 

(b)  It’s aqeous solution is basic

(c)  It is Used in dyeing industries

(d)  On heating it melts in it’s water of crystallization

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On heating it melts in it’s water of crystallization is not true about potash Alum

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