MCQ
The shape of $XeO _2 F _2$ molecule is
- Atrigonal bipyramidal
- Bsquare plannar
- Ctetrahedral
- ✓see-saw

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(At nos. : $L a=57, C e=58, E u=63$ and $Y b=70$ )
$(i)\, {\Delta _f}{H^o}$ of $N_2O$ is $82\, kJ\, mol^{-1}$
$(ii)$ Bond energies of $N \equiv N,N = N,O = O$ and $N = O$ are $946, 418, 498$ and $607\, kJ\, mol^{- 1}$ respectively
The resonance energy of $N_2O$ is......$kJ$
