Advertisements
Advertisements
प्रश्न
State your observation At the cathode, when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.
उत्तर
Acidified aqueous copper sulphate solution is electrolysed with copper electrodes by electrolysis. The electrolysis of an aqueous solution of copper sulphate using copper electrodes (i.e. using active electrodes) results in the transfer of copper metal from the anode to the cathode during electrolysis. The copper sulphate is ionized in aqueous solution.
Copper sulphate solution is ionised by the following chemical equation:
`CuSO_4 ->Cu^(2+) + SO_4^(2+)`
The positively charged copper ions migrate to the cathode, where each gains two electrons to become copper atoms which are deposited on the cathode.
`Cu^(2+) + 2e^(-) -> Cu`
Hence, the color of copper sulphate changes from blue to colorless.
APPEARS IN
संबंधित प्रश्न
When fused lead bromide is electrolysed, we observe ______.
State one relevant observation for the following:
At the anode, when molten lead bromide is electrolyzed using graphite electrodes.
Copy and complete the following table which refers to the conversion of ions to neutral particles.
| Conversion | Ionic equation | Oxidation / Reduction |
| Chloride ion to chlorine molecule | 1)_________ | 2)_________ |
| Lead (II) ion to lead | 3)_________ | 4)_________ |
Explain, why during the electrolysis of copper sulphate using copper electrodes, the colour of solution does not fade?
Explain how electrolysis is an example of Redox reaction.
Correct the following statement:
Lead bromide conducts electricity.
Aqueous solution of nickel sulphate contains \[\ce{Ni^{+2}}\] and \[\ce{SO^{-2}_{4}}\] ions.
- Which ion moves towards the cathode?
- What is the product at the anode?
Give reasons why in the electroplating of an article with silver, the electrolyte sodium argentocynide solution is preferred over silver nitrate solution.
Classify the following substance:
Carbon tetrachloride
Classify the following substance:
Dilute hydrochloric acid
