Question Bank [2022] — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryQuestion Bank [2022]4 Marks
Question
Write working of $NICAD$ storage cell. Also write its applications.
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Answer
Working of NICAD:
NICAD is a rechargeable secondary dry cell. It consists of a cadmium anode. The cathode is nickel(IV) oxide, $NiO _2$ supported on Ni . The electrolyte solution is basic $( KOH )$.
The electrode reactions taking place are:
$Cd _{(s)}+2 OH _{(a q)}^{-} \longrightarrow Cd ( OH )_{2(s)}+2 e^{-}$(Oxidation at anode)
$NiO _{2(s)}+2 H _2 O _{( l )}+2 e^{-} \longrightarrow Ni ( OH )_{2(s)}+2 OH _{(a q)}^{-}$(Reduction at cathode)
Overall cell reaction:
$Cd_{(s)}+NiO_{2(s)}+2 H_2 O_{(l)} \longrightarrow Cd(OH)_{2(s)}+Ni(OH)_{2(s)}$
The cell can be recharged as the reaction products are solids that adhere to the electrode surface. It produces a potential of about 1.4 V . The cell has longer life than other dry cells.
Applications of NICAD:
The NICAD cell is used in electronic watches, calculators, photographic equipment
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