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Question

The gases obtained on electrolysis of water are kept in two test tubes A and B. When an incense stick is brought near test tube A the gas burns with a pop sound. When an incense stick is brought near test tube B it burns more vigorously. What is the ratio of the volume of the gases when they are kept under the same conditions(the pressure and temperature in both the test tubes are the same)?


A

1:2

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B

2:1

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C

1:1

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D

1:4

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Solution

The correct option is B

2:1


It is given that the gases obtained on electrolysis are kept in two test tubes. On electrolysis water decomposes into hydrogen and oxygen and the ratio of the volume is 2:1.

Also, when an incense stick is brought near test tube A the gas burns with a pop sound. Hence, the gas in test tube A is hydrogen.

When an incense stick is brought near test tube B it burns more vigorously. So, test tube B contains oxygen as oxygen supports combustion.

Hence, the gas in test tube A is hydrogen and the gas in test tube B is oxygen, so the ratio of their volumes is 2:1.


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