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ICSE Class 10 Chemistry Question 1 of 23

Solved 2024 Specimen Paper ICSE Class 10 Chemistry — Question 1

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Question

Question 1(i)

An aqueous solution of copper sulphate turns colourless on electrolysis. Which of the following could be the electrodes?

P. anode: copper; cathode: copper

Q. anode: platinum; cathode: copper

R. anode: copper; cathode: platinum

  1. only P
  2. only Q
  3. only R
  4. both Q and R
Answer

only Q

Reason — If platinum anode is used the blue colour of CuSO4 solution fades since the blue Cu2+ ions which are discharged at the cathode are not replaced at the anode.