The cells used in a wrist watch undergo:

physical change

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periodic change

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chemical change

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none of the above

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Solution

The correct option is C chemical change
The cells used undergoes a chemical change because oxidation and reduction of species takes place. Batteries are elctrochemical devices.
for eg : Anode : $Z n \to {Z n}^{2 +} + {2 e}^{-}$
Cathode : ${M n O}_{2} + {2 e}^{-} \to {M n}_{2} O_{3} + 2 {O H}^{(-)}$
$∴$ Chemical changes.

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The cells used in a wrist watch undergo:

The correct option is C chemical changeThe cells used undergoes a chemical change because oxidation and reduction of species takes place. Batteries are elctrochemical devices.for eg : Anode : Zn→Zn2++2e−Cathode : MnO2+2e−→Mn2O3+2OH(−)∴ Chemical changes.