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What is the number of water molecules present in a Ferrous Sulphate crystal?

Options

  1. A1
  2. B3
  3. C5
  4. D7

Correct answer

D. 7

Step-by-step solution

Ferrous sulphate crystals contain 7 water molecules, known as the water of crystallization. The formula is FeSO 4.7 H 2 O . When crystals of ferrous sulphate are heated it loses water of crystallisation and changes their colour. On further heating ferrous sulphate decomposes to ferric oxide with the evolution of two gases containing sulphur.

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