The root mean square speed at NTP for th...

The root mean square speed at NTP for the gases `CH_4,H_2,He and F_2` are in the order

`CH_4lt H_2 ltHe ltF_2`

`HltHe lt CH_4 ltF_2`

`H_2ltHeltF_2ltCH_4`

`F_2ltCH_4ltHeltH_2`

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