A hypothetical electrochemical cell is shown below.
`A|A^(+)(xM)||B^(+)(yM)|B^(+)`
The e.m.g. measured is 0.20V the cell reaction is

Options

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

Answer

D

Explanation

`A//A^(+)(xM)||B^(+)(yM)//B
E_(cell)=+0.20V thereforeDeltaG=-Ve`
Therefore given cell reaction is spontaneous
At anode `AtoA^(+)+e^(-)`
`At cathode {:(ul(B^(+)+e^(-) to B)):}`
`Cell reaction `A+B^(+) to A^(+)+B`