JEE Main Chemistry question

Chemistry Electrochemistry JEE Main

The cathodic reaction of a dry cell is represented by

If there are 8 g of in the cathodic compartment, then the time for which the dry cell will continue to give a current of 2 mA is

(A)25.675 day
(B)51.35 dayCorrect
(C)12.8 day
(D)6.423 day

Answer: (B)

Solution

Molar mass of , so moles of . The equation shows 2 mol consumes 2 mol electrons, i.e. a 1:1 mole ratio, so moles of electrons

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Question ID VK-143526