Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step 1).On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are
  1. physical and chemical changes respectively
  2. chemical and physical changes respectively
  3. both physical change
  4. both chemical change.

AcademicChemistryNCERTClass 7

Correct answer: (c) both physical change

Explanation: Dissolution of copper sulphate powder in water in presence of sulphuric acid is a physical change. On cooling this hot solution, the crystals of copper sulphate are separated, This is also a physical change.

Updated on 10-Oct-2022 13:21:31