Assertion :Cryolite is employed in the extraction of aluminium. Reason: Cryolite lowers the melting point of $A l_{2} O_{3}$ .

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 extraction of aluminium is done by electrolysis.

But first, the aluminium oxide must be made molten so that electricity can pass through it.

Aluminium oxide has a very high melting point (over $2000^{\circ} C$ ), so it would be expensive to melt it.

Instead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than aluminium oxide.

Option A is correct.

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