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Refining of impure metal is done by electrolysis using impure metal as anode.Select the correct statement about this refining.
  • a)
    E°cell of the net reaction is zero
  • b)
    metal to be refined is dissolved in the solution and deposited at the cathode.
  • c)
    Both (a) and (b)
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?
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Refining of impure metal is done by electrolysis using impure metal as...
When impure metal (M) is anode and pure metal is made cathode, then 

Thus, impure metal from the anode is deposited at the cathode.  
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Refining of impure metal is done by electrolysis using impure metal as...
Refining of impure metal is done by electrolysis using the impure metal as the anode. This process is known as electrorefining or electrolytic refining. It is commonly used to purify metals such as copper, zinc, and nickel.

Ecell of the net reaction is zero:

- The Ecell (cell potential) of the net reaction during the electrorefining process is not zero. In fact, it is a positive value. This means that the reaction is spontaneous and can proceed without the need for an external energy source. The positive Ecell indicates that the impure metal at the anode is oxidized and ions are being reduced at the cathode.

Metal to be refined is dissolved in the solution and deposited at the cathode:

- The metal to be refined is indeed dissolved in the electrolyte solution during the electrorefining process. When an electric current is passed through the electrolyte, metal cations from the impure metal at the anode are transferred into the electrolyte as metal ions. These metal ions then migrate towards the cathode, where they are reduced and deposited as pure metal. This deposition of pure metal at the cathode helps in the purification process.

Both (a) and (b):

- The correct statement about the refining of impure metal by electrolysis is that both statement (a) and (b) are correct. The Ecell of the net reaction is not zero, but a positive value indicating the spontaneity of the process. Additionally, the metal to be refined is dissolved in the electrolyte solution and deposited at the cathode, leading to the purification of the metal.

None of the above:

- This option is incorrect as both statement (a) and (b) are correct. The Ecell is not zero, and the metal is dissolved in the solution and deposited at the cathode during the electrorefining process.

In conclusion, the correct statement about the refining of impure metal by electrolysis is that both statement (a) and (b) are correct.
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