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Question

Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

A
The area under the distribution curve remains same as under the lower temperature.
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B
The distribution becomes broader.
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C
The fraction of the molecules increases with the most probable speed.
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D
The most probable speed increases.
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Solution

The correct option is B The fraction of the molecules increases with the most probable speed.
Distribution of molecules (N) with velocity (u) at two temperature T1 and T2 (T2 > T1) is show in the diagram.
At both temperatures, with increase in velocity the distribution of molecules first increases then reaches a maximum value and finally it decreases.
104422_71935_ans.jpg

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