Name the technique which could be used to separate : Iodine crystals from sand

Name a chemical technique which could be used successfully to separate Iodine crystals from sand.

Name the technique which could be used to separate :petrol from crude oil.

Name a chemical technique which could be used successfully to separate Petrol from kerosene oil.

Name the technique used to separate DNA fragments.

Name the technique to separate : Salt from sea water

Name the technique to separate : Salt from sea water

From the methods (or techniques) of distillation, filtration, fractional distillation, chromatography, crystallisation, select and write down the technique you would use to separate : Nitrogen from liquid air.

From the methods (or techniques) of distillation, filtration, fractional distillation, chromatography, crystallisation, select and write down the technique you would use to separate : Unused zinc after the reaction of excess of zinc with dilute sulphuric acid.