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Potash alum, K2SO4.Al2(SO4)3.24H2O, is a double salt. In aqueous solution it shows the characteristic reactions of:

1. Al3+ ions only
2. K+ ions only
3. Al3+, K+ and SO4²- ions
4. Al3+ ions but not K+ ions

Correct answer: Al3+, K+ and SO4²- ions

Solution

On dissolving, potash alum ionises completely to give free K+, Al3+ and SO4²- ions, so the solution shows tests of all three.

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