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

Washing soda

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Gypsum

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Baking soda

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Blue vitriol

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Solution

The correct option is C Baking soda
Formula of:
Blue vitriol - $C u S O_{4} . 5 H_{2} O$
Washing soda - ${Na}_{2} {CO}_{3} . 10 H_{2} O$
Baking soda - ${NaHCO}_{3}$
Gypsum - ${CaSO}_{4} . 2 H_{2} O$

Therefore, baking soda does not contain any water of crystallisation.

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Name a salt which does not contain water of crystallisation

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