Chemistry
Copper sulphate soln. is electrolysed using copper electrodes as seen in diagram.
(i) Which electrode to your left or right is known as the oxidising electrode and why?
(ii) Write the equation representing the reaction that occurs.
(iii) State two appropriate observations for the above electrolysis reaction.
Answer
(i) The electrode connected to the positive terminal of the battery (i.e., electrode on the left) is the oxidizing electrode as anions donate excess electrons to the anode and are oxidized to neutral atoms.
(ii) Cu – 2e– ⟶ Cu2+
(iii) Copper anode shows a loss in mass. The blue colour of aq. copper sulphate soln. remains unchanged.
Related Questions
State which of these will act as a non-electrolyte ?
- Liquid carbon tetrachloride
- Acetic acid
- Sodium hydroxide aqueous solution acid.
- Potassium chloride aqueous solution.
Name: A gas which in the liquid state does not conduct electricity but conducts when dissolved in water.
The observation seen when fused lead bromide is electrolysed is:
- a silver grey deposit at anode and a reddish brown deposit at cathode.
- a silver grey deposit at cathode and a reddish brown deposit at anode.
- a silver grey deposit at cathode and reddish brown fumes at anode.
- silver grey fumes at anode and reddish brown fumes at cathode.
State one appropriate observation for : Electricity is passed through molten lead bromide.