A hypothetical elecrochemical cell is shown below:
`A^(ɵ)|A^(+)(xM)||B^(+)(yM)||B^(o+)`
The emf measured is `+0.20 V`. The cell reaction is

Options

A. `A+B^(+) rarr A^(+)+B`
B. `A^(+)+B rarr A+B^(+)`
C. `A^(+)+e^(-) rarr A, B^(+)+e^(-) rarr B`
D. The cell reaction can't be predicated

Answer

A

Explanation

Since the emf of the hypothetical electrochemical cell is positive `(+0.20 V)`, the choice of electrodes as mentioned in the convention is correct. Thus Anode reaction (oxid):
`A rarr A^(+)+e^(-)`
Cathode reaction (Redu):
`B^(+)+e^(-) rarr B`
Cell reaction
`A+B^(+) rarr A^(+)+B, E_("cell")^(@) = +0.20 V`