Which of the following salts does not contain water of crystallization?
1)blue vitriol
2)baking soda
3)washing soda
4)gypsum
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Answer: (b) Chemical formula of baking soda is NaHC03 (sodium hydrogen carbonate). Chemical formulae of blue vitriol is , washing soda is and gypsum is So, baking powder does not contain water of crystallization.
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