Potassium nitrate crystals can be separated from sand using one of the following set of processes. Identify which one?

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Dissolve, filter, evaporate, crystallise

Filter, dissolve, evaporate, crystallise

Dissolve, evaporate, filter, crystallise

Dissolve, evaporate, crystallise, filter

answer is D.

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Detailed Solution

Mixture of potassium nitrate and sand is added into a beaker of water, potassium nitrate dissolve in water and sand is insoluble in water. By filtration sand can be separated from mixture. After that by evaporation crystals of $K N O_{3}$ can be separated. These crystals can be purified by crystallization method.

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