GKFix MCQ Question

Which of the following is the correct formula for potash alum (phitkari)?

• A. K+(H2O)6 Al3+(H2O)6(SO4^2–)2
• B. K2SO4.Al2(SO4)3.24H2O
• C. KAl(SO4)2
• D. K2SO4·Al2(SO4)3