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

Correct Answer: (1) dissolve the impure sample of alum in water, filter and evaporate the filtrate

Explanation: To prepare the pure alum from the given impure sample, dissolve the impure alum in water than filter it. All the insoluble impurities (sand) will remain in the filter paper. On evaporating the water (filtrate), pure alum will be obtained.

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Updated on: 10-Oct-2022

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