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Question

A mixture of gases O2, H2 and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is:


A
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B
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C
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D
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Solution

The correct option is C

Explanation for correct option:

(C)

  1. As the container contains the three gases O2,H2 and CO along with charcoal, which is a good absorber.
  2. Charcoal will adsorb gases and due to this with an increase in time, the pressure of gases will decrease.
  3. After some time when the surface of charcoal becomes saturated the pressure in the container becomes constant.
  4. The graph here illustrates the same study.

Explanation for incorrect options:

(A)

  1. This graph shows linear relationship between time and pressure.
  2. It shows that with time the pressure of gases remain constant and do not change.
  3. However this is not the case.
  4. Hence option A is incorrect.

(B)

  1. This graph shows linear relationship between time and pressure.
  2. It shows that with time the pressure of gases decrease.
  3. However this is not the case.
  4. Hence option B is incorrect.

(D)

  1. This graph shows that pressure of gases increase with time and then becomes constant.
  2. However this is not the case.
  3. Hence option D is incorrect.

Hence option C is correct.


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