Consider the following statements:
1. Crystallization is the process of deriving crystals of pure substance from their solution.
2. A bonding between constituent atoms or molecules takes place during crystallization.
3. It is an example of chemical change.
Which of the statements given above is/are correct?

Correct answer: (b) 1 and 2 only

Explanation

Crystallisation obtains crystals of a pure substance from its solution, for example copper sulphate from its saturated solution, so statement 1 is correct.

As the crystals form, the particles take fixed places in a lattice, held by bonds and attractive forces, so statement 2 is accepted as correct. No new substance forms and the crystals can be dissolved again, so it is a physical change, not a chemical one: statement 3 is wrong.