Available Answers

1. 1.

   Name the various gases present in air. Give their percentages also.

2. 2.

   How do you show that oxygen is needed for burning?

3. 3.

   Why does a person climbing on high mountains need oxygen cylinder?

4. 4.

   Explain Biological nitrogen fixation.

5. 5.

   Explain Industrial Nitrogen fixation.

6. 6.

   Explain Condensation.