MCQ
Which one of the following oxides is expected exhibit paramagnetic behaviour
- A$C{O_2}$
- B$S{O_2}$
- ✓$Cl{O_2}$
- D$Si{O_2}$
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Reason : Oxidation state of $Cr$ in $Na_2CrO_4$ is $+VI$

$\frac{2}{3} Al_2O_3 \rightarrow \frac{4}{3} Al + O_2,\,$ $\Delta G = +966\,kJ\,mol$
The potential difference needed for electrolytic reduction of $Al_2O_3$ at $500^o C$ is at least ...... $V$.