Assertion :In the electrolytic reduction of $A l_{2} O_{3}$ cryolite is used. Reason: Cryolite is an ore of aluminium.

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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Assertion is incorrect and Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The electrolysis of pure alumina is not feasible because it is a bad conductor of electricity and its fusion temperature is high. Cryolite and fluorspar are added to alumina which lowers the fusion temperature to 1140 K and makes alumina good electrical conductor.
Then, the electrolysis of fusion mixture is carried out.
Thus both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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