Four students took separately the mixture of sand, common salt and ammonium chloride in beakers, added water, stirred the mixture well and then filtered. They reported their observations as shown below.
Student | As residue | In the filtrate |
---|
I | Ammonium chloride | Sand Common salt |
II | Common salt, Sand | Ammonium chloride |
III | Sand, Ammonium chloride | Common Salt |
IV | Sand | Ammonium chloride, Common salt |
Who reported the observations in the correct order of the components as residue and in the filtrate ?
(1) I
(2) IV
(3) III
(4) II
Correct answer: (3) III
Explanation: Solid ammonium chloride directly converted to the gas phase, and can easily be separated out from the mixture as residue
Common salt dissolves in water and after evaporation, it can also be separated from the mixture as residue.
So ammonium chloride and common salt are categorized as residue while sand was left in the mixture as filtrate.
So, the observations made by student III were correct.
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