Assertion :Cryolite is used in electrolytic extraction of $A l$ from alumina. Reason: It dissolves alumina.

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
Pure alumina melts at about 2000°C and is a bad conductor of electricity. If fused cryolite and fluorspar are added, the mixture melts at 900°C and $A l_{2} O_{3}$ becomes a good conductor of electricity and metallic Al is liberated at the cathode.
So, in the extraction of aluminium by electrolytic process alumina $A l_{2} O_{3}$ is used along with fluorspar and cryolite.

Thus, both assertion and reason are correct but reason is not the correct explanation for assertion.

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