Statement-I: In C2 vapours, the bond order is two where both the bonds are pi bonds.Statement-II: Formal charge on terminal nitrogen atom of :N..=N=O..:  is “-1”.

I) C2  .   .   .KK'σ2s 2σ2s*2π2px2π2py2Bond  order=8−42=2;Both the bonds are pi bonds because there are four electrons in two pi bonding molecular orbitals.II) :N..=N=O..:Formal charge = Number of electrons in free state - number of electrons of lone pairs - number of bondsFormal charge on terminal nitrogen = 5 - 4 - 2 = -1