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Question

A depolarizer used in dry cell is


A

Ammonium chloride

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B

Manganese dioxide

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C

Potassium oxide

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D

Sodium phosphate

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Solution

The correct option is B

Manganese dioxide


The correct option is option D:

The explanation for the correct option:

  1. Depolarizers are substances that are employed in primary cells to stop hydrogen gas bubbles from accumulating.
  2. A battery depolarizer always acts as an oxidizer because it absorbs electrons during the cell's discharge.
  3. A graphite rod or a metal electrode is covered in a low moisture electrolyte paste in a dry cell, which is made of a metal container. In most cases, the metal container will be made of zinc, whose base serves as a negative electrode (anode) and a positive electrode (carbon road) (cathode).
  4. Manganese dioxide and a low moisture electrolyte, such as ammonium chloride paste, that can only produce 1.5V of voltage and is irreversible, surround it.
  5. The moistened electrolyte undergoes a reduction reaction that involves the elements manganese dioxide (MnO2) and ammonium chloride (NH4Cl), with graphite acting as solid support for the reaction. 2NH4++2MnO2Mn2O3+2NH3+H2O
  6. An oxidation reaction takes place on the zinc container, which acts as the anode. ZnZn+2+2e-
  7. The most common dry cell is the zinc-carbon cell, commonly known as the Leclanche cell.
  8. The dry cell uses manganese dioxide as a depolarizer.
  9. Also MnO2 produces moisture keeping the solution moist so that ionic mobility increases.

Final answer: A depolarizer used in dry cells is manganese dioxide.


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