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JEE Main 202330 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
30 January
Shift
Evening Shift
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Main 2023 · 30 January · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals

Given below are two statements: Statement I: During Electrolytic...

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 Al2O3{Al}_{2}{O}_{3} is mixed with Na3AlF6{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.

Na3AlF6{Na}_{3}{AlF}_{6} is added during electrolysis of Al2O3{Al}_{2}{O}_{3} to lower the melting point and increase conductivity.
Reactions at cathode and anode are as follows:
Cathode: Al3+(melt)+3e−→Al(l){Al}^{3 +} ( melt ) + 3{e}^{-}\overset{}{\to}Al ( l )

Anode: C(s)+O2−(melt)→CO(g)+2e−C(s)+2O2−(melt)→CO2(g)+4e−C ( s ) + {O}^{2 -} ( melt ) \to CO ( g ) + 2{e}^{-}C ( s ) + 2{O}^{2 -} ( melt ) \to {CO}_{2} ( g ) + 4{e}^{-}

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