Multiple choice

Which is called Potash alum?

  1. KAl(SO4)2. 12H2O

  2. K2 SO4 . Al2 (SO4)3 . 24H2O

  3. K2 SO4 . Al2 (SO4)3 . 6H2O

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potash alum is KAl(SO4)2·12H2O, a double sulfate containing potassium and aluminum in 1:1 ratio with 12 water molecules. Option B shows 2:1 stoichiometry with 24 waters, option C shows 2:1 with 6 waters - neither matches the correct formula of common potash alum.