Chemistry
Which of the following methods is used to separate potassium nitrate and sodium chloride from their mixture ?
- distillation
- crystallisation
- fractional distillation
- fractional crystallisation
Elements, Compounds & Mixtures
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Answer
fractional crystallisation
Reason — Fractional crystallization is the process of separating solids based on differences in solubility. In a mixture of salt and potassium nitrate, potassium nitrate crystallizes first when the solution is cooled, leaving sodium chloride behind. This process is repeated to separate the two.
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Assertion (A): Elements and compounds are pure substances.
Reason (R): Elements and compounds are made up of only one kind of atoms and molecules respectively.
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