Which one of the following salts does not possess water of

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

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Potassium permanganate

Blue vitriol

Washing soda

Mohr's salt

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Answer is Wrong!

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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