Among the following,identify the gas which has the greatest average speed of its molecules?

At a given temperature,which gas will have a higher speed between $H_2$ and $O_2$? Why?

According to the kinetic molecular theory of gases,the root mean square velocity is proportional to .......

Which of the following pairs will diffuse at the same rate through a porous plug?

For a gaseous state,if the most probable speed is denoted by $C^*$,average speed by $\overline{C}$,and root mean square speed by $C$,then for a large number of molecules,the ratio of these speeds is:

If $r_1, r_2$ and $r_3$ represent the most probable speeds of three different gases at the same temperature as shown in the figure,with molar masses $M_1, M_2$ and $M_3$ respectively,what is the correct order of the molar masses of these gases?