Q.

(A) : The Daniel cell becomes dead after some time.
(R) : Oxidation potential of zinc anode increases and that of copper cathode decreases.

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a

(A) is true but (R) is false

b

(A) is false but (R) is true

c

Both (A) and (R) are true and (R) is the correct explanation of (A)

d

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

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 Because at equilibrium reduction potential of cathode and oxidation potential of anode becomes equal in magnitude.Ecell0becomes zero 

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(A) : The Daniel cell becomes dead after some time.(R) : Oxidation potential of zinc anode increases and that of copper cathode decreases.