Which of the following gases will have least rms speed at a given temperature?

Which of the following gases has maximum rms speed at a given temperature?

Which of the following gases has maximum rms speed at a given temperature?

Which of the following gases has maximum rms speed at a given temperature?

Which of the following gases would have the highest rms speed at 0^(@)C ?

Which of the following gases would have the highest RMS speed at 0^@C :

Which of the following gases will have least volume if 10g of each gas is taken at same temperature and pressure?

Which of the following gases will have least volume if 10g of each gas is taken at same temperature and pressure?