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. The cell reaction cannot be predicted
B. `A + B^(+) rarr A^(+) + B`
C. `A^(+) + B rarr A + B^(+)`
D. `A^(+) + e^(-) rarr A, B^(+) + e^(-) rarr B`

Answer

B

Explanation

`A rarr A^(+) +e^(-)` (oxidation at anode)
`B^(+) + e^(-) rarr B` (reduction at cathode)
`A+ B^(+) rarr A^(+)+B` (cell reaction).