(i) 31 g potassium nitrate is needed. (ii) Potassium chloride crystals will separate as the solution cools because its solubility decreases. (iii) Solubility generally increases with temperature, but the increase differs among salts.
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Distillation is suitable because the liquids are miscible and their boiling points differ by 30 °C. The liquid A, having the lower boiling point, vaporises first and is then condensed separately.
Option (IV) is correct. Muddy water, milk and blood are heterogeneous mixtures, while brass is a homogeneous mixture because its components are uniformly distributed throughout the mixture as distinct phases in all parts of it.