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How potassium nitrate salt is obtained?

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How potassium nitrate salt is obtained?

(a) From a mixture of KCl and NaNO3

(b) From a mixture of KCl and HNO3

(c) From a mixture of KCl and NH4NO3

(d) From a mixture of KCl and KNO3

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My doubt is from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Correct option is (a) From a mixture of KCl and NaNO3

The explanation: Potassium nitrate salt is obtained by adding potassium chloride to hot solutions of sodium nitrate. After that sodium chloride got separated and KNO3 is crystallizes on cooling.

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