Question

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 :

• A. (A) is true but (R) is false
• B. (A) is false but (R) is true.
• C. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• D. Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Answer 1

Answer: (D)

(A) Aluminium is reactive metal so Aluminium is extracted by electrolysis of Alumina with molten mixture of Cryolite
(B) Cryolite, $Na _{3} AlF _{6}$
Here $Al$ is in $+3 O.S.$