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Standard VIII
Physics
Question

What is observed when copper sulphate solution is electrolysed using a platinum anode?
  1. Copper ions (cations) move towards the cathode.
  2. None of the above
  3. Copper ions (cations) move towards the anode.
  4. Copper ions (cations) move towards the bottom.

A
Copper ions (cations) move towards the bottom.
B
Copper ions (cations) move towards the cathode.
C
Copper ions (cations) move towards the anode.
D
None of the above
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Solution
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In the aqueous solution, copper sulphate dissociates into its respective ions. On passing electric current, the copper ions (cations) move towards the cathode and get deposited as copper. Simultaneously, the sulphate ions (anions) move towards the anode. So, blue colour of the solution disappears.
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