Available Answers

1. 1.

   ls the air a mixture or a chemical compound?

2. 2.

   Name the main constituents of the air.

3. 3.

   What is the source of oxygen in nature?

4. 4.

   When liquid air is warmed, which gas comes out first, nitrogen or oxygen ?

5. 5.

   Where does respiration take place in our body?

6. 6.

   Name the process in which large amount of heat and light are given out.