# Please answer Ques. 73 -${K}_{2}S{O}_{4}.A{l}_{2}{\left(S{O}_{4}\right)}_{3}.24{H}_{2}O$ is known as Potash alum. It's aqueous solution does not show the properties of - 1) ${K}^{+}$ Ion 2) $A{l}^{3-}$ Ion 3) $S{{O}_{4}}^{2-}$ Ion 4) ${O}^{2-}$ Ion

The solution is as follows:

1. The correct option is (d) O2- ions.

2. This is because oxygen is non-ionisable in potash alum. Rest of the ions are ionisable.

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