p-Block Elements-I 2 Question 29
29. Anhydrous $\mathrm{AlCl}_{3}$ is covalent. From the data given below, predict whether it would remain covalent or become ionic in aqueous solution.
(Ionisation energy for $\mathrm{Al}=5137 \mathrm{~kJ} \mathrm{~mol}^{-1}$
$$ \begin{aligned} & \Delta H_{\text {hydration }} \text { for } \mathrm{Al}^{3+}=-4665 \mathrm{~kJ} \mathrm{~mol}^{-1} \ & \Delta H_{\text {hydration }} \text { for } \mathrm{Cl}^{-}=-381 \mathrm{~kJ} \mathrm{~mol}^{-1} \end{aligned} $$
(1997, 2M)
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Solution:
| $\boldsymbol{X}$ | $\boldsymbol{Y}$ | $\boldsymbol{Z}$ |
|---|---|---|
| Yeast | Fermentation | Ethanol |
| Mica | Layered structure | Insulator |
| Superphosphate | Bone ash | Fertiliser |
| Carbon fibres | Graphite | Reinforced plastics |
| Rock salt | Crystalline cubic | Preservative |
| Carborundum | Diamond structure | Abrasive |
