Question

What is the value of x in the potash alum $K_{2}S{O}_4.A{l}_x{(S{O}_4)}_3.24H_{2}O$ ?

• A. 4
• B. 1
• C. 2
• D. None of these

Answer 1

Answer: (C)

Potashalum is a double salt. Potash alum :
$K_{2}S{O}_4.A{l}_x{(S{O}_4)}_3.24H_{2}O$
Ion Valency
Hence, the compound of $A{l}^{3+}$ and $S{O}_4^{2-}$ is $A{l}_2{(S{O}_4)}_3$
On comparison $x=2$