Amongst the following, which should have the highest $rms$ speed at the same temperature?

At what temperature $(^o C)$ will the $rms$ speed of $CO_2$ be equal to the $rms$ speed of $CO$ at $STP$?

When the temperature of a gas is increased from $30^{\circ} C$ to $930^{\circ} C$,the root mean square speed of the gas would

The $RMS$ velocity of dihydrogen $(H_2)$ is $\sqrt{7}$ times more than that of dinitrogen $(N_2)$. If $T_{H_2}$ and $T_{N_2}$ are the temperatures of dihydrogen and dinitrogen respectively, then the correct relationship between them is:

If the average velocity of $N_2$ molecule is $0.3 \, m/s$ at $27 \, ^\circ C$,then the velocity will be $0.6 \, m/s$ at ........... $K$.

The temperature of $O_2$ gas at which its $r.m.s.$ speed is equal to the most probable speed of $H_2$ gas at $300 \ K$ is ............... $K$.