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Q.

How much air does oxygen occupy?


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a

1/4rth

b

1/5th

c

1/2th

d

1/7th 

answer is B.

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Detailed Solution

1/5th of air is oxygen occupied.
1/5th of air is oxygen, and the relaxation 4/5th is nitrogen displaying that we will do an easy experiment. The candle burns for a while and is then extinguished. The water rises from the threshold of the inverted tumbler to occupy approximately 1/5th of it. The candle burnt until oxygen became present. Once the oxygen within the tumbler became used up, it stopped burning.
 
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