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Question
Explain the construction and working of a dry cell.
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Solution
- A dry cell is a portable form of a leclanche cell.
- It consists of zinc vessel which acts as a negative electrode or anode.
- The vessel contains a moist paste of saw dust saturated with a solution of ammonium chloride an chloride.
- The ammonium chloride acts as an electrolyte.
- The purpose of zinc pide is to maintain the moistness of the paste being highly gyroscopic.
- The carbon rod covered with a brass cap is placed in the middle of the vessel. It acts as positive electrode or cathode.
- It is surrounded by a closely packed mixture of charcoal and manganese dioxide (Mn02) in a muslin bag.
- Here Mn02 acts as depolarizer. The zinc vessel is sealed at the top with pitch or shellac.
- A small hole is provided in it to allow the gases formed by the chemical action to escape.
- The chemical action inside the cell is the same as in avalanche cell.
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