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JEE Main202330 Jan 2023Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Given below are two statements: Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode. Statement II: During the Hall-Heroult electrolysis process, purified Al 2 O 3 is mixed with Na 3 AlF 6 to lower the melting point of the mixture. In the light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. AStatement I is incorrect but Statement II is correct
  2. BBoth Statement I and Statement II are incorrect
  3. CStatement I is correct but Statement II is incorrect
  4. DBoth Statement I and Statement II are correct

Correct answer

A. Statement I is incorrect but Statement II is correct

Step-by-step solution

In Electrolytic refining, the pure metal is used as cathode and impure metal is used as anode. Electrolytic refining of aluminium is called Hall-Heroult process. Na 3 AlF 6 is added during electrolysis of Al 2 O 3 to lower the melting point and increase conductivity. Reactions at cathode and anode are as follows: Cathode: Al 3 + ( melt )   +   3 e -   →   Al ( l ) Anode: C ( s )   +   O 2 -   ( melt )   →   CO ( g )   +   2 e - C ( s )   + &#16

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