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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb138

Select the correct statement(s) about alums.

AAlums are double salts that give the constituent ions in water.
B $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$ has twelve water molecules of crystallisation per formula unit.
CThe aqueous solution of potash alum is basic.
DPotash alum and chrome alum are isomorphous.

Answer: A, B, D

Alums are double salts (A true),

KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O

has 12

H X_{2} O

(B true). Hydrolysis of

Al X^{3 +}

makes the solution acidic (C false). Both crystallise in the same cubic form and are isomorphous (D true).

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