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The alkaline earth metal nitrate that does not crystallise with water molecules, is:

1. Mg(NO3)2
2. Sr(NO3)2
3. Ca(NO3)2
4. Ba(NO3)2

Correct answer: Ba(NO3)2

Solution

Barium nitrate is unique among the alkaline earth metal nitrates listed because it does not form a hydrate, meaning it does not incorporate water molecules into its crystalline structure, unlike the others.

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