A mixture of one mole each of \( \mathrm{H}_{2}, \mathrm{He} \) and \( \mathrm{O}_{2} \) each are enclosed in a cylinder…

A mixture of one mole each of \( \mathrm{H}_{2}, \mathrm{He} \) and \( \mathrm{O}_{2} \) each are enclosed in a cylinder of volume \( \mathrm{V} \) at temperature \( \mathrm{T} \). If the partial pressure of \( \mathrm{H}_{2} \) is \( 2 \mathrm{~atm} \), the total pressure of the gases in the cylinder is

[JEE Main 2020, 3 Sep (Shift 2)]