CBSE Class 12 · 2010 · All India Compartment · Redox Reactions and ElectrochemistryShort Answer

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What is a nickel–cadmium cell? State its one merit and one demerit over the lead storage cell. Write the overall reaction that occurs during the discharging of this cell.

Solution

The nickel–cadmium cell is a secondary (rechargeable) cell with a cadmium anode and a cathode of nickel(IV) oxide (NiO

_{2}

) paste, in a KOH electrolyte.
Merit over the lead storage cell: considerably longer life.
Demerit: it is more expensive to manufacture.
Overall discharge reaction:

Cd (s) + 2Ni (OH)_{3} (s) ⟶ CdO (s) + 2Ni (OH)_{2} (s) + H_{2} O (l)

CBSE Class 12 Board · 2010 · All India Compartment · Subjective

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