MCQ
Which of the following molecules has pyramidal shape
- ✓$PC{l_3}$
- B$S{O_3}$
- C$CO_3^{2 - }$
- D$NO_3^ - $

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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.