An aqueous solution of potash alum is -

Acidic

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Alkaline

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Neutral

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None of these

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Solution

The correct option is A
Acidic

$K_{2} S O_{4} . A I_{2} (S O_{4})_{3} . 24 H_{2} O K_{2} S O_{4} + H_{2} O \to K (O H) + H_{2} S O_{4} A I_{2} (S O_{4})_{3} + H_{2} O \to A l (O H)_{3} + H_{2} S O_{4}$

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[K_{2} S O_{4} . A l_{2} (S O_{4})_{3} .24 H_{2} O]

Why is aqueous solution of alum acidic?

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