Question

State one appropriate observation for the following:
Electricity is passed through molten lead bromide.

Answer 1

Step 1 Definition

• Electrolysis is a process where ions are released from an electrolyte.
• Electrolytes are good conductors of electricity.
• The molten Lead Bromide undergoes the process of electrolysis to release Lead and Bromide ions.
• The reaction is given by,

${\mathrm{PbBr}}_2\left(\mathrm{l}\right)\stackrel{\mathrm{Electrolysis}}{\rightleftharpoons }{\mathrm{Pb}}^{2+}\left(\mathrm{aq}\right)+2{\mathrm{Br}}^{-}\left(\mathrm{aq}\right)$

Step 2 Observation of statement

A silvery-white metal, Lead (Pb) is deposited at the cathode and Bromine vapours are obtained at anode.