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Which of the following gases will have hightest average molecular speed at `25^(@)C` ?

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Which of the following gases will have hightest average molecular speed at `25^(@)C` ?
A. `Ar`
B. `CH_(4)`
C. `N_(2)`
D. `CH_(2)F_(2)`
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Correct Answer - B
`U_(avg) = sqrt((8RT)/(pi M))`
`U_(avg) prop (1)/(sqrtM)`
`M darr U_(avg) uarr`
(1) `Ar rarr 40`
(2) `CH_(4) rarr 16`
(3) `N_(2) rarr 28`
(4) `CH_(2)F_(2) rarr 52`
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