General Principles And Processes Of Isolation Of Metals Question 8
Question 8 - 30 January - Shift 2
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:
(1) Statement I is incorrect but Statement II is correct
(2) Both Statement I and Statement II are incorrect
(3) Statement I is correct but Statement II is incorrect
(4) Both Statement I and Statement II are correct
Show Answer
Answer: (1)
Solution:
Formula: Purification or Refining of Metal
In Electrolytic refining, the pure metal is used as cathode and impure metal is used as anode.
$Na_3 AlF_6$ is added during electrolysis of $Al_2 O_3$ to lower the melting point and increase conductivity.
