An electrochemical cell is set up as Pt ( H_2 ,1 atm ) ,| ,0.1 M HCl ,|| ,0.1 M acetic acid ,| ,( H_2 ,1 atm ) Pt . The emf of this cell will not be zero because

JEE Main Chemistry question

An electrochemical cell is set up as . The emf of this cell will not be zero because

(A)The pH of 0.1 M HCl and 0.1 M acetic acid is not the sameCorrect
(B)The acids used in the two compartments are different
(C)The emf of a cell depends on the molarities of the acids used
(D)The temperature is constant

Answer: (A)

Solution

HCl is a strong acid (nearly fully dissociated) so 0.1 M HCl has a lower pH, while acetic acid is weak (only partially dissociated) so 0.1 M acetic acid has a higher pH. Since both

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Question ID VK-143773