What is the order of the method applied to separate the components of a mixture of salt, sand and ammonium chloride?
What is the order of the method applied to separate the components of a mixture of salt, sand and ammonium chloride?
The correct option is C Sublimation, dissolving in water, filtration and evaporation
Explanation for the correct option:
(C) Sublimation, dissolving in water, filtration and evaporation:
- Sublimation (the process of direct conversion of a solid to gaseous form) helps to separate Ammonium chloride from the rest of the mixture as only ammonium chloride is sublimable in the mixture whereas sand and salt do not undergo sublimation. Salt or Sodium chloride and sand will remain in the mixture.
- This mixture of sand and salt is dissolved in water. Salt gets dissolved in water while sand does not.
- This solution is filtered and filtrate will contain dissolved salt whereas sand will be left on the filter paper. This separates sand from the mixture.
- The filtrate obtained is subjected to evaporation where water evaporates but sodium chloride remains in the china dish after evaporation as it is a non-volatile solute.
Explanation for the incorrect options:
(A) Dissolving in water, filtration, evaporation and sublimation: Dissolving in water in the first step will dissolve both ammonium chloride and salt. Filtering will separate sand but salt and ammonium chloride stay together and when evaporated, both ammonium chloride and water will evaporate from the mixture.
(B) Dissolving in water, evaporation and sublimation: Dissolving in water in the first step will dissolve both ammonium chloride and salt. Also, evaporation after dissolving will leave a mixture of salt, ammonium chloride and sand together as they are non-volatile. So it serves no purpose.
(D) Moving a magnet, dissolving in water and sublimation: Magnet can not be used to separate anything in this mixture as magnet is used to separate a magnetic substance like Iron
Hence, option (C) is correct.
Sublimation, dissolving in water, filtration and evaporation
Explanation for the correct option:
(C) Sublimation, dissolving in water, filtration and evaporation:
- Sublimation (the process of direct conversion of a solid to gaseous form) helps to separate Ammonium chloride from the rest of the mixture as only ammonium chloride is sublimable in the mixture whereas sand and salt do not undergo sublimation. Salt or Sodium chloride and sand will remain in the mixture.
- This mixture of sand and salt is dissolved in water. Salt gets dissolved in water while sand does not.
- This solution is filtered and filtrate will contain dissolved salt whereas sand will be left on the filter paper. This separates sand from the mixture.
- The filtrate obtained is subjected to evaporation where water evaporates but sodium chloride remains in the china dish after evaporation as it is a non-volatile solute.
Explanation for the incorrect options:
(A) Dissolving in water, filtration, evaporation and sublimation: Dissolving in water in the first step will dissolve both ammonium chloride and salt. Filtering will separate sand but salt and ammonium chloride stay together and when evaporated, both ammonium chloride and water will evaporate from the mixture.
(B) Dissolving in water, evaporation and sublimation: Dissolving in water in the first step will dissolve both ammonium chloride and salt. Also, evaporation after dissolving will leave a mixture of salt, ammonium chloride and sand together as they are non-volatile. So it serves no purpose.
(D) Moving a magnet, dissolving in water and sublimation: Magnet can not be used to separate anything in this mixture as magnet is used to separate a magnetic substance like Iron
Hence, option (C) is correct.
