- ASublimation.
- BCrystallisation.
- CDistillation.
- DNone of these.
Explanation:
Crystallisation process is based on the difference in the solubilities of the compound and the impurities in a suitable solvent. The impure compound is dissolved in a solvent in which it is sparingly soluble at room temperature but appreciably soluble at higher temperature.
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Assertion ($A$): Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $-57 \mathrm{~kJ} \mathrm{~mol}^{-1}$
Reason ($R$): Enthalpy of neutralisation is the amount of heat liberated when one mole of $\mathrm{H}^{+}$ions furnished by acid combine with one mole of ${ }^{-} \mathrm{OH}$ ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below.
$[$ Given $: \sqrt{3}=1.73, \sqrt{2}=1.41]$