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Q.

Is it true that air is necessary for burning things?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
If we cover a burning candle with a glass jar, we can see after a few minutes the candle is extinguished. Here the supply of air is stopped because of the glass jar, so the burning of candles is also stopped. This experiment validates that air supports burning. And it is necessary for burning. As no air would mean no oxygen and thus the absence of a supporter of combustion will not allow burning.
 
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