1. Observe Fig. 5.6 and fill in the blanks of the following statement: (i) The solubility of compound ‘A’ in water at 20 °C is ________ (less than/more than/similar to) its solubility at 60 °C.

2. The solubility of compound ‘B’ at 20 °C is ________ (less than/more than/similar to) its solubility at 60 °C.

3. Observe Fig. 5.6 and fill in the blanks of the following statement: (iii) The solubility of ________ increases more than that of ________ with an increase in the temperature.

4. What is the process of forming crystals from a saturated solution called?

5. Which of the following is toxic and should not be touched with bare hands during the experiment?

6. Fill in the blank: The principle of purification by ________ is based on the differences in the solubility of a substance at different temperatures.

7. Sulfuric acid is required for the crystallization of only some salts.

8. The purpose of adding a drop of dilute sulfuric acid to the copper sulfate solution during the experiment is:

9. Which step involves filtering the hot solution to remove insoluble impurities?

10. Fill in the blank: Allow the solution to cool slowly without disturbing it, resulting in the formation of larger, shiny, well-shaped and ________ crystals.