(a) Give four uses of oxygen.(b) How is oxygen naturally renewed in ai

1.	(a) Give four uses of oxygen.(b) How is oxygen naturally renewed in air ?
Answer» (a) Uses of oxygen 1. Oxygen is used by firemen, miners, aviators, sea divers and even by every living being. 2. Oxygen is necessary for burning of fuels. 3. Oxygen mixed with hydrogen as a fuel produces.a flame with a very high temperature of about 2800°C. 4. As a fuel in spacecraft. (b) All living beings use atmospheric oxygen in breathing and burning of fuels and in the formation of oxides of nitrogen. Yet the amount of oxygen in the air remains more or less constant. This is because green plants return oxygen to the atmosphere by the process of photosynthesis.

(a) Give four uses of oxygen.(b) How is oxygen naturally renewed in air ?

Answer»

(a) Uses of oxygen

1. Oxygen is used by firemen, miners, aviators, sea divers and even by every living being.

2. Oxygen is necessary for burning of fuels.

3. Oxygen mixed with hydrogen as a fuel produces.a flame with a very high temperature of about 2800°C.

4. As a fuel in spacecraft.

(b) All living beings use atmospheric oxygen in breathing and burning of fuels and in the formation of oxides of nitrogen. Yet the amount of oxygen in the air remains more or less constant. This is because green plants return oxygen to the atmosphere by the process of photosynthesis.

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