Question

When electricity is passed through molten lead bromide, product Pb is formed at the cathode?
A. True
B. False

Answer 1

Hint: Electrolytic cells are used for the electrolysis of certain compounds. This is done by using the flow of electrons to overcome the activation energy barrier of the non-spontaneous redox reaction.

Complete answer:
The three primary components of electrolytic cells are:
Cathode which is negatively charged for electrolytic cells, Anode which is positively charged for electrolytic cells and Electrolyte.
Electrolyte provides the medium for the exchange of electrons between the cathode and the anode.
When we apply an electrical current then the positive ions migrate to the cathode while the negative ions will migrate to the anode. As we know the concept that like charges repel each other while unlike attract each other so the positive charge ions are always attracted to the negative charged ions.
Electrolysis of molten lead bromide can be shown as follows:
At anode: $2B{{r}^{-}}\to B{{r}_{2}}$ during this process reddish brown gas is evolved.
At cathode: $P{{b}^{2+}}+2{{e}^{-}}\to Pb$ the main product is formed at the cathode and here oxidation occurs i.e. loss of electrons takes place.
Thus we can say that when electricity is passed through molten lead bromide, product Pb is formed at the cathode. Given statement is true

Option A is the correct answer.

Note:
Electrolytic cells are mainly used for electroplating i.e. process of deposition of one metal on another metal. Electroplating is a process that creates a metal coating on a solid substrate through the reduction of cations of that metal by means of a direct electric current.