Question

which of the following salt no water of crystallization ?

a) blue vitriol
b) washing soda
c) baking soda
d) Gypsum​

Answer 1

blue vitriol

this is your ans

Answer 2

answer- baking soda

explanation-

Baking soda is sodium bicarbonate in anhydrous form without any water of crystallisation and it is widely used as dry fire extinguisher because of its alkali nature.