JEE Main202131 Aug 2021Morning ShiftChemistryAlcohols Phenols and EthersActual
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 Al 2 O 3 with cryolite. Reason (R) : The oxidation state of Al in cryolite is + 3 . In the light of the above statements, choose the most appropriate answer from the options given below :
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A).
- B(A) is true but (R) is false.
- CBoth (A) and (R) are correct but (R) is not the correct explanation of (A).
- D(A) is false but (R) is true.
Correct answer
C. Both (A) and (R) are correct but (R) is not the correct explanation of (A).
Step-by-step solution
In electrolytic reduction of Al 2 O 3 we use cryolite to increase conductivity and decrease melting point. Cryolyte is Na 3 AIF 6 , Oxidation number of Al is + 3