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Which one of the following salts does not possess water of

June 1, 2025 by rawan239

Which one of the following salts does not possess water of crystallization?

Potassium permanganate

Blue vitriol

Washing soda

Mohr's salt

This question was previously asked in

UPSC NDA-2 – 2022

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The correct answer is Potassium permanganate.

Salts that do not possess water of crystallization are called anhydrous salts. Among the given options, Potassium permanganate (KMnO₄) is typically an anhydrous salt. Blue vitriol (CuSO₄·5H₂O), Washing soda (Na₂CO₃·10H₂O), and Mohr’s salt ((NH₄)₂Fe(SO₄)₂·6H₂O) are common examples of hydrated salts, meaning they contain a fixed number of water molecules (water of crystallization) associated with their crystal structure.

Water of crystallization is water that is stoichiometrically bound into a crystal. It is necessary for the maintenance of the crystalline properties but can usually be removed by heating, resulting in the anhydrous salt.

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