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Standard X
Chemistry
Electrolysis and Electrolytes
Question

During the electrolysis of the aqueous solution of copper sulphate using Pt electrodes, the reaction taking place at anode electrode is:
  1. Cu2++2e−→Cu
  2. Cu→Cu2++2e−
  3. 2H2O→4H++O2+4e−
  4. H2O+e−→OH−+12H2

A
2H2O→4H++O2+4e−
B
Cu2++2e−→Cu
C
H2O+e−→OH−+12H2
D
Cu→Cu2++2e−
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Solution
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At anode oxidation of H2O occurs since the oxidation potential of H2O is greater than the oxidation potential of SO2−4 ion.

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Similar Questions
Q1
During electrolysis, O2(g) is evolved at anode in
⎡⎢ ⎢ ⎢ ⎢ ⎢⎣(correct)Cu(s)⟶Cu2+(aq)+2e−E⊝Cu|Cu2+=−0.34V(wrong)2H2O(l)⟶O2(g)+4H⊕(aq)+4e−E⊝H2O|O2=−1.23V⎤⎥ ⎥ ⎥ ⎥ ⎥⎦

In(d)⎡⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢⎣(correct)Ni(s)⟶Ni2+(aq)+2e−E⊝Ni|Ni2+=−0.25V(wrong)4⊝OH(aq)⟶O2(g)+2H2O(l)+4e−E⊕⊝OH|O2=−0.4V⎤⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥⎦

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Q2
During the electrolysis of the aqueous solution of copper sulphate using Pt electrodes, the reaction taking place at anode electrode is:
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Q3
Assertion: Starting from aq. copper [II] sulphate solution, equations for the reactions at the cathode and anode during electrolysis of aq. CuSO4 using active copper electrodes is;
at anode:
Cu+2+2e−→Cu
at cathode:
Cu→Cu+2+2e−
Reason: Oxidation always take place at anode and reduction at cathode.
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Q4
1.Cu2++2e−⟶Cu,E0=0.337V
2.Cu2++e−⟶Cu+,E0=0.153V
Electrode potential,E0 for the reaction Cu++e−⟶Cu
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Q5
During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction taking place at the cathode is:
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