Which statement is not true about potash alum?

Which statement is not true about potash alum?
  1. On heating it melts and loses its water of crystallization.
  2. It's aqueous solution is basic in nature.
  3. It is used in dyeing industries.
  4. It's empirical formula is $\mathrm{KAl}\left(\mathrm{SO}_{4}ight)_{2} \cdot 12 \mathrm{H}_{2} \mathrm{O}$.

Solution

Alum form acidic solution due to hydrolysis of $\mathrm{Al}^{3+}$ /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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