The positive plate of nickel-iron cell is made up of

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. Nickel hydroxide
  2. Ferrous hydroxide
  3. Lead peroxide
  4. Potassium hydroxide

Answer (Detailed Solution Below)

Option 1 : Nickel hydroxide
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Nickel-Iron cell:

  • Nickel-iron cell is in the charged condition, the active material on positive plates is Ni(OH)4 and that on the negative plates is iron (Fe)
  • The positive and negative plates are held in a nickel-plated steel container; the plates being insulated from each other by hard rubber strips
  • The container contains 21 per cent solution of KOH (electrolyte) to which is added a small amount of lithium hydrate (LiOH) for increasing the capacity of the cell
  • It has lesser weight and longer life than that of a lead-acid cell
  • The emf of this cell is about 1.36 V
  • These cells are very suitable for portable work
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