Assertion :Alumina is leached from bauxite using caustic soda Reason: Leaching is used when ore alone but not gangue is soluble in a suitable solvent

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The separation of the alumina from the impurities in the bauxite ore is usually accomplished by the Bayer Process. In this process, the ground bauxite is leached with caustic soda ( $N a O H$ ) to produce soluble sodium aluminate ( $N a A l O_{2}$ ), leaving the impurities in the insoluble residue. Leaching is used when ore alone but not gangue is soluble in a suitable solvent. Ores mine from the earth are usually contaminated with a large amount of impurities such as soil, sand, etc known as gangue.

hence, option A is correct.

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