Describe construction and working of dry cell.
Construction: It consists of zinc container (vessel) which acts as an anode. Cathode is a Graphite rod. It acts as inert electrode. The Graphite rod is surrounded by a paste of MnO2 (Manganese dioxide) & powdered Carbon (Black).The cell is filled with a paste of NH4Cl & ZnCl2 prepared in water. The cell is sealed at the top by wax or resin.
Working
At zinc anode: -
Dissolution of zinc electrode to form zinc ions