Question 4 - MCQs from NCERT Exemplar - Chapter 2 Class 10 - Acids, Bases and Salts

Last updated at August 14, 2026 by

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

(A) Blue vitriol

(B) Baking soda

(C) Washing soda

(D) Gypsum

 

Answer

Water of Crystallisation-Teachoo.jpg

Water of crystallisation is the amount of water molecules present in a unit of salt

 

From the given options, let’s check out their formula

  • Blue vitriol i.e. CuSO 4 .5H 2 O has 5 water of crystallization
  • Baking soda i.e. NaHCO 3 has no water of crystallisation
  • Washing soda i.e. Na 2 CO 3 .10H 2 O has 10 water of crystallization
  • Gypsum i.e. CaSO 4 .2H 2 O has 2 water of crystallisation

 

Among the following options, only baking soda does not contain water of crystallisation


So, the correct option is (b) Baking soda

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