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प्रश्न
Name and briefly explain four ways by which pollution of air is caused by humans.
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उत्तर
Pollution of air is caused by humans in the following ways :
- Large amount of coal burnt in thermal plants throw out huge amounts of smoke and ash in the atmosphere.
- Vehicles using petrol or diesel give out a lot of smoke and harmful gases like carbon-dioxide, lead, carbon- monoxide.
- Burning of garbage causes a lot of pollution due to the formation of carbon-monoxide, sulphur dioxide and nitrogen dioxide.
- Pesticides spread in the fields also cause air pollution.
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संबंधित प्रश्न
Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
Complete and balance the following chemical equation.
\[\ce{HgO ->[heat]}\] ______ + _______
Statement given below is incorrect. Write the correct statement :
Carbon dioxide gas allows the earth to radiate out heat rapidly.
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
Write ‘true’ or ‘false for the following;
Carbon dioxide is given out during photosynthesis
State a reason why there is a balance in the amount of carbon dioxide in the air, even though carbon dioxide is released into the atmopshere by various processes.
Why is air considered as a mixture?
_____ gas turns lime water milky.
Why do traffic assistants wear a mask on duty?
Assertion: Carbon dioxide occurs as carbonates in nature.
Reason: Carbon dioxide can exist as a liquid at atmospheric pressure.
