Alkali metal sulphates generally crystallize as double salts with trivalent metal sulphates, forming compounds known as Alums. Which of the following alkali metals is the EXCEPTION and does NOT form a

Question

Alkali metal sulphates generally crystallize as double salts with trivalent metal sulphates, forming compounds known as Alums. Which of the following alkali metals is the EXCEPTION and does NOT form an alum?

Prashant Kotian · Accepted Answer

Correct answer: C. Alums have the general formula . Lithium sulphate () does not form alums because the ion is too small to fit properly into the highly specific, rigid crystal lattice structure required for alum formation.

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