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Arrange the alkaline earth metal hydroxides in the correct order of increasing thermal stability.

1. Ba(OH)2 < Sr(OH)2 < Ca(OH)2 < Mg(OH)2
2. Mg(OH)2 < Sr(OH)2 < Ca(OH)2 < Ba(OH)2
3. Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2
4. Ba(OH)2 < Ca(OH)2 < Sr(OH)2 < Mg(OH)2

Correct answer: Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2

Solution

On descending Group 2, cation size increases and the hydroxides become more thermally stable, so the order of increasing stability is Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2.

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