Assertion :Dry cell is very commonly used in flash lights,toys, calculators etc. Reason: In secondary cells, electrode reaction can be reversed by external supply of electric current.

If both Assertion and Reason are correct and Reason is the correct explanation of assertion.

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If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

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If Assertion is correct but Reason is incorrect.

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If Assertion is incorrect but Reason is correct.

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Solution

The correct option is B If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
For Assertion:
The dry cell or carbon-zinc batteries for flashlights appeared in 1898, Carbon-zinc is the least expensive battery and normally comes with consumer devices when batteries are included. These general purpose batteries are used for low power drain applications, such as remote controls, flashlights, childrens toys and wall clocks.
For reason:
A secondary or storage battery is capable of being recharged; its electrode reactions can proceed in either direction. During charging, electrical work is done on the cell to provide the free energy needed to force the reaction in the non-spontaneous direction.
Thus Option B is correct.

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Similar questions

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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and

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Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

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Choose the correct option.

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