(a) The blue colour of crystals of a substance changed on heating in a closed test tube but the colour was regained after sometime on cooling. Name the substance and write its chemical formula. Explain the phenomenon involved. (b) Write name and chemical formula of two such compounds whose one formula unit is associated with 10 and 2 water molecules respectively.

(a) The blue colour of crystals of a substance changed on heating in a

1.	(a) The blue colour of crystals of a substance changed on heating in a closed test tube but the colour was regained after sometime on cooling. Name the substance and write its chemical formula. Explain the phenomenon involved. (b) Write name and chemical formula of two such compounds whose one formula unit is associated with 10 and 2 water molecules respectively.
Answer» (a) The blue colour of crystals of a substance changed on heating in a closed test tube but the colour was regained after sometime on cooling. Name the substance and write its chemical formula. Explain the phenomenon involved. (b) Write name and chemical formula of two such compounds whose one formula unit is associated with 10 and 2 water molecules respectively.