Question

how will you separate a mixture of common salt, sand and iron fillings

Answer 1

iron will be saprate by magnet and then we will make solution of sand and salt and then filter so salt pass by filtration and salt remain over the filter paper

Answer 2

iron filings will be separated by magnetic separation

sand will be separated by dissolving the remaining mixture in water and filtering it

common salt will be obtained after evaporating the filtrate