nature of matter and composition - Category wise Question and Answer Practice Test with Solutions

Question : 36 [BPSC]

The chemical formula of plaster of paris is

a) $(CaSO_4).2H_2$O

b) $CaSO_4.5H_2$O

c) 2CaS$O_4.H_2$O

d) COSO₄. MGO

Question : 37

Purity of a solid substance can be checked by its

a) solubility in water

b) melting point

c) boiling point

d) solubility in alcohol