LECLANCHE CELL
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The Leclanché cell, invented by French scientist Georges Leclanché in 1866, is a type of primary cell. Let’s delve into its construction, working, and applications:

  1. Construction:

    • The Leclanché cell consists of the following components:
      • Anode (Negative Terminal): Made of zinc (reductant).
      • Cathode (Positive Terminal): Composed of carbon.
      • Depolarizer: Contains manganese dioxide (oxidizer).
      • Electrolyte: A conducting solution of ammonium chloride.
    • The original cell used a porous pot, but variations like the agglomerate block cell and the sack cell were developed to reduce internal resistance.
    • In the agglomerate block cell, manganese dioxide is mixed with binding agents and pressed into blocks.
    • The sack cell replaces the porous pot with a wrapping of canvas or sacking and uses a larger zinc cylinder as the anode.
  2. Working:

    • The cell operates through the following chemical reactions:
      • Zinc particles on the surface of the anode oxidize, releasing electrons and forming zinc ions in the electrolyte solution:

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