MCQ
Back bonding in $BF_3$ does not affect
- APlanarity, Lewis acidic strength and bond angle
- BBond length, Hybridisation and bond strength
- ✓Bond angle, Planarity and Geometry
- DLewis acidity, Bond length and $(B-F)$ bond order
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Given : $\Delta H _{ f }^{\ominus}\left( Al _2 O _3\right)=-1700\,kJ\,mol ^{-1}$
$\Delta H _{ f }^\theta\left( Fe _2 O _3\right)=-840\,kJ\,mol ^{-1}$
Molar mass of $Fe , Al$ and $O$ are $56,27$ and $16\,g\,mol ^{-1}$ respectively.