When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?
Important Questions on Electrolysis
Explain the following: Zinc can produce hydrogen on reacting with acids but copper cannot. Explain.
Give reasons for the following: Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side by side, i.e., a redox reaction.
Give reasons for the following: The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.
Give reasons for the following: Lead bromide undergoes electrolytic dissociation in the molten state but is a non-electrolyte in the solid state.
Give reasons for the following: Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.
Give reasons for the following: The ratio of hydrogen and oxygen formed at the cathode and anode is by volume.
Give reasons for the following: In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.
Give reasons for the following: Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.
