MCQ
${}_{24}Cr$ has configuration $3{d^5}\,4{s^1}$ instead of $3{d^4}\,4{s^2}$ because of
- AHigher exchange energy
- BSymmetrical distribution of electron
- ✓$(A)$ and $(B)$ both
- DNone of these
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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.
