5.
Matter around us can exist in three different states, namely, solid, liquid and gas. The correct order of their compressibility is

6.
Consider the following statements about mixture?
1. A substance can be separated into other kinds of matter by any physical process.
2. Dissolved sodium chloride can be separated from water by the physical process of evaporation.
Which of the statements given above is/are correct?

9.
Sodium vapour lamps glow with yellow colour. This is due to