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Q.

Assertion (A): aluminum is extracted from bauxite by the electrolysis of molten mixture of Al2O3  with cryolite.
Reason (R): the oxidation state of “A1” in cryolite is +3. In the light of the above statement, choose the most appropriate answer from the options given below. 
 

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a

Both (A) and (R) are correct and (R) is the correct explanation of (A)

b

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

(A)  is false but (R) is true

answer is B.

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Detailed Solution

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Aluminum is reactive metal. So aluminum is extracted by electrolysis of alumina with molten mix true of cryolite. The oxidation state of A1 in cryolite (Na3AlF6)  is +3 
 

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