Equal volumes of nitrogen and oxygen react to give `"___________"`

In a closed vessel of volume v, a moles of nitrogen and b moles of oxygen are made to react to given nitric oxide, according to reaction , N_(2)+O_(2) hArr 2NO . If at equilibrium , 2x moles of NO are obtained , then

A closed vessel contains equal number of nitrogen and oxygen molecules at pressure of P mm . If nitrogen is removed from the system, then the pressure will be:

Atomic hydrogen reacts with oxygen to give

Nitrogen, oxygen, fluorine, helium