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Question

Which of the following options is/are correct with respect to CH4 and SO2? (Equal mass of CH4 and SO2 are contained in a 2 L container at same temperature)

A
CH4 will diffuse 4 times faster than SO2
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B
Average speed of CH4 is 2 times that of SO2
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C
Both have the same average kinetic energy per mol
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D
CH4 has double the partial pressure of SO2
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Solution

The correct option is C Both have the same average kinetic energy per mol
Moles of CH4= 4 times of moles of SO2, So pCH4=4pSO2

rCH4rSO2=pCH4pSO2MSO2MCH4=416416=8

¯VCH4¯VSO2=MSO2MCH4=2
K.E. (per mol) =(32)RT, So same for both.
Partial pressure of a gas is directly proportional to mole fraction of that particular gas.

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