What is the negative terminal of a dry cell battery made of?

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RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. Zinc
  2. Steel
  3. Aluminium
  4. Copper

Answer (Detailed Solution Below)

Option 1 : Zinc
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Explanation:

Cell:

  • A cell is an electrochemical device consisting of two electrodes and an electrolyte.
  • The chemical reaction between the electrodes and the electrolyte produces a voltage.

Cells are classified as:

  • Dry cells
  • Wet cells

Dry cells:

  • A dry cell has paste or gel electrolyte.
  • It is semi-sealed and could be used in any position.
  • The cell consists of a zinc (connected to the negative terminal of a dry cell battery) container that also acts as an anode and the cathode is a carbon (graphite) rod surrounded by powdered manganese dioxide and carbon.
  • The space between the electrodes is filled with a moist paste of ammonium chloride and zinc chloride.

Wet cells:

  • It consists of two plates and a liquid electrolyte.
  • These cells have vent holes to allow the gases to escape during charging and discharging.
  • The most common wet cell is the lead acid cell; wet cells can be recharged for reuse.
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