Matrix is defined as:

the unwanted foreign material present in the ore

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the flux added to remove the unwanted impurities from ore

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the slag formed as a result of the reaction of flux with gangue

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the material used in the reduction of metal oxide to metal

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Solution

The correct option is A the unwanted foreign material present in the ore
The ore that exists inside our earth contains dust, stone, quartz and other foreign materials. The impurities are called gangue or matrix in the ore. During the concentration process, care is taken to remove the matrix from the ore.

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