What is the formula of potash alum?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → K2SO4·Al2(SO4)3·24H2O
Potash alum (fitkari) is a double salt of potassium sulphate and aluminium sulphate with 24 molecules of water of crystallisation, K2SO4·Al2(SO4)3·24H2O. It is also written as KAl(SO4)2·12H2O and is used to purify muddy water.