Question

A teacher gave an impure sample of alum containing fine sand as impurity to a student. He asked him to recover pure alum from this sample. The correct procedure to be followed would be to (1) dissolve the impure sample of alum in water, filter and evaporate the filtrate
(2) dissolve the impure sample of alum in alcohol and filter
(3) move a magnet over the impure sample of alum
(4) dissolve the impure sample of alum in carbon disulphide, filter and evaporate the filtrate

Answer 1

Answer:

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Answer 2

A teacher gave an impure sample of alum containing fine sand as impurity to a student. He asked him to recover pure alum from this sample. The correct procedure to be followed would be to

Option 1) dissolve the impure sample of alum in water, filter and evaporate the filtrate

Explanation:

To make pure alum, first dissolve the impure alum in water instead of filtering it. All insoluble impurities remain in the filter paper. Then distill the water and you will get pure alum.

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