MCQ
Which one of the halogen acids is a liquid
- ✓$HF$
- B$HCl$
- C$HBr$
- D$HI$
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$\frac{2}{3} Al_2O_3 \rightarrow \frac{4}{3} Al + O_2,\,$ $\Delta G = +966\,kJ\,mol$
The potential difference needed for electrolytic reduction of $Al_2O_3$ at $500^o C$ is at least ...... $V$.


| Column $I$ | Column $II$ |
| $(A)$ $\left(\mathrm{CH}_3\right)_2 \mathrm{SiCl}_2$ | $(p)$ Hydrogen halide formation |
| $(B)$ $\mathrm{XeF}_4$ | $(q)$ Redox reaction |
| $(C)$ $\mathrm{Cl}_2$ | $(r)$ Reacts with glass |
| $(D)$ $\mathrm{VCl}_5$ | $(s)$ Polymerization |
| $(t)$ $\mathrm{O}_2$ formation |