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Q.

Is it true that the air contains dust and smoke?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Air is a mixture of so many gases. The major gases present in the air are oxygen and nitrogen. 1% of air is dust, smoke, water vapour, and some gases. Some tiny particles are seen in the sun's rays entering a dark room. These are dust particles. This proves that air contains dust particles. Air also contains smoke which the factories and vehicles release. The smoke is also released due to the burning of fuels which mixes in the air. So, the air contains dust and smoke.
 
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