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How the impurities of ore are removed by...

How the impurities of ore are removed by chemical method?

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In Contact process impurities of arsenic are removed by:

Fluoride can not be removed by ion-exchange method. Why?

(A): Levigation is used for the separation of oxide ores from impurities (R) : Ore particles are removed by washing in a current of water.

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The impurities are oxidised in this method.

Which of the following is a chemical method ?

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