In the given image, candles A and B are covered with identical jars. Jars covering A and B are completely filled with air and pure oxygen, respectively. Select the correct statement that corresponds to the given information.

Both the candles, A and B, will burn for the same period of time.

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Candle A will burn for a longer period of time than candle B.

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Candle B will burn for a longer period of time than candle A.

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Solution

The correct option is C Candle B will burn for a longer period of time than candle A.

Air contains 21% oxygen whereas pure oxygen has only oxygen and no other gas.

And, we know that oxygen is necessary for combustion. So, the more the amount of oxygen supply, the longer the candle will burn.

Thus, candle B covered with the jar filled with pure oxygen will burn for a longer period than candle A.

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Similar questions

Q. Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

Q. Question 18
Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar, a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?

(a) What is combustion?

(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

Q. Radhika performed an experiment and wrote a record of what she had done. Can you rewrite these sentences in the correct order to describe her work? Draw a picture of her experiment. Can you explain what she observed?
(a) I used my wrist watch to check how long each candle burned.
(b) In the lid of the first jar, I punched several small holes.
(c) With my older brother's help, I fixed one candle in each jar and lit them.
(d) I collected the following items: two identical jam jars with lids, two identical small candles, matches, a nail and a hammer.
(e) I left the second jar open.
(f) I wanted to compare the time for which the candles could burn in the two jars.
(g) The second candle continued to burn for a long time.
(h) The candle in the first jar went out first and the jar was filled with smoke.
(i) I closed the first jar with its own lid.

Explain why, when a burning candle is covered with an inverted gas jar, the candle gets extinguished after some time.

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