Question

Describe the construction of a dry cell​

Answer 1

Answer:

A dry cell consists of a zinc container whose base acts as the negative electrode. The carbon rod placed at the centre with a brass cap acts as the positive electrode. This is surrounded by a mixture of manganese dioxide and charcoal in a muslin bag. The electrolyte uses is a moist paste of ammonium chloride. The outer body (excluding the base) of the zinc container is insulated with cardboard. When the dry cell is connected in a circuit comprising a bulb, current flows in the circuit due to the chemical reaction that takes place in the cell. This makes the bulb glow. The dry cell is a primary cell and it cannot be recharged.

Explanation:

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Answer 2

Answer:

Construction:-

1.It consists of a mercury coated cylindrical zinc vessel.A card boared washer is placed at the bottom of the vessel.

2.The inside walls of zinc vessel are lined with blotting paper.

3.There is a carbon rod with a brass cap which stands at the centre of the vessel.It acts as the positive pole.

4.The space b/w the lining and the carbon rod is packed with a paste of a mixture of a little water and aluminium chloride,magnese dioxide and graphite powder.

5.The top of the cell is covered with saw dust ,sand and pitch to prevent the paste to become dry by evaporation.The top is provided with a pin hole to allow the gas to escape . paper or plastic is wrapped round the cell.