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ICSE Class 10 Chemistry Question 6 of 23

Solved Sample Paper 1 — Question 11

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11
Question

Question 1(xi)

During the electrolysis of aqueous copper sulphate using copper electrodes, copper ions are generated at the anode that go into the copper sulphate solution used as electrolyte.

Which of the following is correct regarding the mass of anode

P. Mass of anode remains same
Q. Mass of anode gradually decreases
R. Mass of anode gradually increases

  1. Only P
  2. Only Q
  3. Both P and Q
  4. P, Q and R
Answer

Only Q

Reason — SO42- and OH1- ions migrate to the anode but neither are discharged since the copper anode loses electrons more easily than SO42- and OH1-. Hence, copper anode shows a loss in mass.