Identify the incorrect statements about potash alum

Correct option is C

Potassium alum, potash alum, or potassium aluminium sulfate  is chemically defined as the double sulfate of potassium and aluminium, with chemical formula KAl(SO4)2. It is commonly encountered as the dodecahydrate, KAl(SO4)2·12H2O.
Upon dissolution, it gives K+, Al3+, and SO42-​ ions, supporting the assertion in (a). The aqueous solution of potash alum is slightly acidic due to hydrolysis of the aluminum ion, validating (b). However, its ions remain chemically identifiable and do not lose their identity, rendering (c) incorrect.
Potassium alum is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder. It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.