At `127^(0)C` and `1` atm pressure, a mixture of a gas contains `0.3` moles of `N_(2),0.2` moles of `O_(2)` ,the volume of the mixture is ( in `L`)

A gaseous mixture contains 4.0g of H_(2) and 56.0g of N_(2) . The mole fraction of H_(2) in the mixture is

If the density of a mixture of O_(2)&N_(2) at N.T.P. is 1.258 g//l. The partial volume of O_(2) in 3 mole of mixture is

If partial pressure of N_2 in gaseous mixture containing equal mass of CO and N_2 is 0.5 atm then the total pressure of gaseous mixture is

A cylinder contains 0.3 moles of N_(2) , 0.1 mole of O_(2) and 0.1 mole of helium. If the total pressure is one atm, what is the partial pressure of oxygen in mm Hg:-