In the electrolytic refining of Copper (electrolyte is $C u S O_{4}$ solution + dil $H_{2} S O_{4}$ ;Pure Cu cathode and Impure Cu anode), metallic impurities having ___ than Cu are deposited as anode sludge.

lower reduction potential

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higher reduction potential

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higher oxidation potential

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lower oxidation potential

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Solution

The correct options are
B higher reduction potential
D lower oxidation potential

The whole process of electrolysis should be carried out with precision. This is because we need to keep the electrode potentials (for the desired reactions) in mind and choose the electrodes and electrolyte accordingly. Also, there should be no competing reactions.

In this case (electrolyte is $C u S O_{4}$ solution + dil $H_{2} S O_{4}$ ; Pure Cu cathode and Impure Cu anode), metallic impurities having lower oxidation potential(or higher reduction potential) than Cu are deposited as just below the anode. This is called the anode mud or anode sludge. Some of the impurities could be precious metals like Gold or Silver.

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In the electrolytic refining of Copper (electrolyte is $C u S O_{4}$ solution + dil $H_{2} S O_{4}$ _;Pure Cu cathode and Impure Cu anode), metallic impurities having lower oxidation potential than Cu are deposited as __ sludge.

Match the column (for electrolytic refining of Cu):
$\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & A n o d e & (p) & T h i n s h e e t s o f p u r e C u (b) & C a t h o d e & (q) & A n a q u e o u s s o l u t i o n o f c o p p e r s u l p h a t e c o n t a i n i n g H_{2} S O_{4} (c) & E l e c t r o l y t e & (r) & A g, A u (d) & A n o d e m u d & (s) & I m p u r e m e t a l o f C u \end{matrix}$

Q. Assertion: Starting from aq. copper [II] sulphate solution, equations for the reactions at the cathode and anode during electrolysis of aq.

C u S O_{4}

using active copper electrodes is;
at anode:

C u^{+ 2} + 2 e^{-} \to C u

at cathode:

C u \to C u^{+ 2} + 2 e^{-}

Reason: Oxidation always take place at anode and reduction at cathode.

Q. Assertion :In electrolyte refining of metal, impure metal is made cathode while a strip of pure metal is used as anode. Reason: The pure metal gets deposited at anode as anode mud.

Q. During electrolytic refining of copper.
(a) Pure copper acts as anode.
(b) Pure copper acts as cathode.
(c) Impure copper acts as anode.
(d) Impure copper acts as cathode.

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In the electrolytic refining of Copper (electrolyte is CuSO4 solution + dil H2SO4 ;Pure Cu cathode and Impure Cu anode), metallic impurities having ___ than Cu are deposited as anode sludge.

In the electrolytic refining of Copper (electrolyte is $C u S O_{4}$ solution + dil $H_{2} S O_{4}$ ;Pure Cu cathode and Impure Cu anode), metallic impurities having ___ than Cu are deposited as anode sludge.