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Cell voltages and half-cell potentials a...

Cell voltages and half-cell potentials are often compeared under standard conditions called the standard state at a specified temperature (298K). The standard state requires all reagents to be pure with all gases at unit fugacity, all ions at unit activity and all electrical connections between half-cells to be made with platinum. Suppose following are half cell reaction, with respective emf (s) are -0.25 V and -0.3V.
Cell reaction I `underset("1 atm")(Pt(H_(2))|HCl)`
Cell reaction II `underset("1 atm")(Pt(H_(2))|H_(2)SO_(4))`
pH value of cell reaction I is

A

4.23

B

5.23

C

5.08

D

5.32

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