Which statement is not rue about potash alum?

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Its empirical formula is KAl(SO4)2.12H2O

Its aqueous solution is basic in nature,

It is used in dyeing industries

On heating it melts and loses its water of crystallization

answer is B.

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Detailed Solution

Alum undergo cationic hydrolysis.Cation of weak base and anion of weak acid only undergoing hydrolysis.Due to the liberation of H+ ion the aqueous solution shows acidic nature and not basic nature.III) It is used in dyeing industry, It is used in the purification of water, It is used in tanning of leather.On heating it loses water of crystallisation.

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