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A depolarizer essentially acts an agent which can prevent
a) the covering of copper plates by a layer of hydrogen
b) the back emf

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Both a and b are true

Only b is true

Only a is true

Neither a nor b

answer is C.

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Detailed Solution

The term depolarizer has been used to denote a substance used in primary cell to prevent build up of hydrogen gas bubbles. Consequently Back emf also gets prevented.

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