Which of the following salts does not contain water of crystallisation?

1. Blue vitriol
2. Baking soda
3. Washing soda
4. Gypsum

Correct Answer: (b) Baking soda

Explanation: The chemical formula of baking soda is NaHC03 (sodium hydrogen carbonate). The chemical formulae of blue vitriol is CuSO4.5H2O, washing soda is Na2CO3.10H2O and gypsum is CaSO4.2H2O. Hence, baking powder does not contain water of crystallization.

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Updated on: 10-Oct-2022

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