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(D) Leaching is a process of concentration of ore based on the principle of relative or selective solubility. In this process,the ore is treated with

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Leaching

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(D) Leaching is a process of concentration of ore based on the principle of relative or selective solubility. In this process,the ore is treated with a suitable reagent that dissolves the ore but leaves the impurities (gangue) undissolved. For example,in the extraction of $Al$ from bauxite ore $(Al_2O_3 \cdot 2H_2O)$,the ore is treated with $NaOH$ solution,which dissolves $Al_2O_3$ to form sodium aluminate,while impurities like $Fe_2O_3$ and $SiO_2$ remain insoluble.

The process which involves the treatment of the ore with a suitable reagent so as to make it soluble but not the impurities is called:

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