Which Mixtures Cannot Be Separated By Magnet. It separates chaff lighter from heavier grains in two different heaps. Chalk powder grain and chaff.

Maize flour and iron filings. Chalk powder grain and chaff. Give reasons for the following.
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Charcoal powder and iron filings B. Sulphur and charcoal powder cannot be separated by magnetic separation. Sulphur and charcoal powder cannot be separated by magnetic suspension. Which one of the following mixtures can be separated by dissolving filtering and evaporating.