Which of the following is not true about potash alum

Options

A. Its empirical formula is `KAl(SO_(4))_(2).12H_(2)O`
B. Its aqueous solution is basic
C. It is used in dyeing industries
D. On heating it melts in its water of crystallization

Answer

B

Explanation

Potash alum: `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
Empirical formula : `Kal(SO_(4))_(2).12H_(2)O`
Its aqueous solution is acidic due to cationic hydrolysis