Question

E. Answer the following in short.
1. Write down the composition of air in per cent by volume.
2. Why is nitrogen essential for plants? 3. Which gas is used in the manufacture of ammonia? Name the process by which ammonia is manufactured
. 4. What is respiration?
5. What are the uses of krypton and xenon?
6. What is the importance of dust particles in air?
7. Name the processes that consume oxygen from the air.
8. What is rusting? State the conditions required for rusting. ​

Answer 1

Answer:

A4.A process by which living things produce energy from food. Respiratory usually needs oxygen

Explanation:

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Answer 2

Answer:

1. Nitrogen - 78% Oxygen - 21% Carbon dioxide - 0.03 % Inert gases - 0.9%.
2. Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide.
3. natural gas (methane).
4. The Haber Process.
5. Krypton is used commercially as a filling gas for energy-saving fluorescent lights. It is also used in some flash lamps used for high-speed photography. Xenon is used in certain specialized light sources. It produces a beautiful blue glow when excited by an electrical discharge.
6. Dust is a vital component of the atmosphere for many reasons. One is providing something for The water to condense on.
7. Respiration
8. Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture.The exposure of iron to oxygen in the presence of moisture leads to the formation of rust. This phenomenon takes place in the presence of moisture and air. So, the presence of air and water vapor in air are two necessary conditions for the rusting of iron.