How is the impurity of iron present in several substances removed in industries?

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Solution

A mixture of iron filings and carbon powder can be separated by using a magnet in a similar way. And a mixture of iron filings and sand can also be separated by using a magnet. A carpenter can also separate iron nails from saw-dust by using a magnet. This is because iron nails stick to the magnet but saw-dust does not. In industries, the impurity of iron present in several substances is removed by the use of magnets.

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