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The figure below shows the features of a dry cell (lenclanche). Use the information in the figure to answer the following questions.
Phyf2midt1q23

  1. Name the parts
  2. Explain the purpose of B
  3. State 2 defects of a dry cell and give their remedies

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  1.     
    • A - Seal and insulator 
    • B – Zinc case  
    • C – Mixture of carbon and manganese (IV) oxide    
    • D – Carbon rod 
  2. Zinc case acts as a negative electrode
  3.    
    1. Polarisation
      Remedy – Adding a depolarizer e.g potassium dichromate
    2. Local action
      Remedy – By amalgamation
      Accept – use of pure zinc or coating zinc with mercury 
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