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  • Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of <

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of \mathrm{Al}_{2} \mathrm{O}_{3} with cryolite. Reason (R) : The oxidation state of \mathrm{Al}  in cryolite is +3. In the light of the above statements, choose the most appropriate answer from the options given below :
Option: 1 Both (A) and (R) are correct and (R) is the correct explanation of (A).
Option: 2 (A) is true but (R) is false.
Option: 3 Both (A) and (R) are correct but (R) is not the correct explanation of (A).
Option: 4 (A) is false but (R) is true.

Answers (1)

best_answer

As we have learnt,
Al is extracted from molten mixture of Alumina \mathrm{\left ( Al_{2}O_{3} \right )}  with cryolite \mathrm{\left ( Na_{3}AlF_{6}\right )}.

Cryolite is added to decrease the melting point of alumina and also to increase conductivity of the melt.

Hence, the correct answer is Option (3)

Posted by

Ritika Jonwal

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