The correct statement with respect to dinitrogen is

i)N2+O2→250CNo  reaction ii)N2→dia  magnetic  gas iii)   liq  N2is  used  in   cryosurgery iv)   statement  is  correct S+F2→with  N2diluted  SF4 i)  Ist  reaction is possible only at high temp ii)   N2  contains completely filled bonding molecular orbitals.