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Q.

Uav,Urms and Ump are average, root mean square, and most probable speeds of the gas respectively at constant temperature T.  The molar mass of the gas is M.  Then

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a

no molecule can have a speed less than Ump/2

b

no molecules can have a speed greater than 2Urms  

c

Ump<Uav<Urms

d

The Kinetic energy of a mole of gas is   34M Ump2

answer is C, D.

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Detailed Solution

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Ump<Uav<Urms

Ump=2RTM            Ump2=2RTM

34mv2mp=32RT

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