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A ________ is combination of different substances such that no chemical reaction takes place between them.
__________ is needed to remove unwanted substances from mixture.
Drinking tap water can create various health problems.
Water purifier is used to remove impurities in tap water such as ______.
Industrial waste water should be left in water resources as it is.
____ is needed to obtain useful substance from mixture.
For separation of iron from iron ore we use ________ properties of materials.
We get petrol,kerosene, diesel from oil obtained from earth crust by separation method called _____.