An electrochemical cell is shown below `Pt, H_(2)(1 "atm")|HCl(0.1 M)|CH_(3)COOH(0.1 M)|H_(2)(1 "atm")`, The emf of the cell will not be zero, because

Options

A. the temperature is constant.
B. e.m.f depends on molarities of acids used
C. acids used in two compartments are different .
D. pH of 0.1 M HCl and 0.1 M `CH_(3) COOH` is not same

Answer

D

Explanation

For a concentration cell having different concentrations of ions .
`E = (0.0591)/(n) "log" (C_(1))/(C_(2))`
If all the concentration are identical then obviously the cell voltage is zero . But as the pH of 0.1 M HCl (strong acid ) and pH of `0.1 M CH_(3) COOH` is (weak acid ) not same , therefore the cell voltage is not zero.