XeF4 is prepared by
heating Xe and F2 in 1 : 4 ratio at 5-6 atm pressure.
heating Xe and F2 in 1 : 1 ratio at 5-6 atm pressure
heating Xe and F2 in 1 : 5 ratio at 5-6 atm pressure
Refer to methods of preparation of XeF4.