MCQ
The crystal lattice of ice is mostly formed by
- Aionic forces
- Bcovalent bonds
- Cintramolecular $H-$ bonds
- ✓covalent as well as $H-$ bonds
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$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.
$(II)$ $1,3-$dihydroxy benzene
$(III)$ $1,4-$dihydroxy benzene
$(IV)$ Hydroxy benzene
The increasing order of boiling points of above mentioned alcohols is

| Column $I$ | Column $II$ |
| $(A) \ \mathrm{B}_2$ | $(p)$ Paramagnetic |
| $(B) \ \mathrm{N}_2$ | $(q)$ Undergoes oxidation |
| $(C) \ \mathrm{O}_2^{-}$ | $(r)$ Undergoes reduction |
| $(D) \ \mathrm{O}_2$ | $(s)$ Bond order $\geq 2$ |
| $(t)$ Mixing of ' $\mathrm{s}$ ' and ' $\mathrm{p}$ ' orbitals |