A student purchases common salt from the market which is contaminated with Ammonium Chloride N H 4 Cl - Identify the technique that he should adopt to obtain pure N aCl-A- Mix the sample in acetone and evaporate the decanted solution-B- Mix the sample in water and evaporate the solution-C- Mix the sample in water and evaporate the decanted solution-D- Heat the sample- then mix it in water and evaporate the decanted solution-

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Standard VII

Chemistry

Evaporation vs Boiling

A student pur...

Question

A student purchases common salt from the market which is contaminated with Ammonium Chloride ( ${N H}_{4} C l$ ). Identify the technique that he should adopt to obtain pure $N a C l$ .

Mix the sample in water and evaporate the solution.

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Mix the sample in water and evaporate the decanted solution.

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Mix the sample in acetone and evaporate the decanted solution.

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Heat the sample, then mix it in water and evaporate the decanted solution.

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Solution

The correct option is C
Mix the sample in acetone and evaporate the decanted solution.

Ammonium Chloride is a substance which directly converts to its vapour upon heating, without forming a liquid state. This process is called sublimation. The vapours can be collected and condensed into a separate flask. On the other hand, $N a C l$ does not get evaporated on heating and can be separated easily.

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A student purchases common salt from the market which is contaminated with Ammonium Chloride (NH4Cl ). Identify the technique that he should adopt to obtain pure NaCl.

A student purchases common salt from the market which is contaminated with Ammonium Chloride ( ${N H}_{4} C l$ ). Identify the technique that he should adopt to obtain pure $N a C l$ .