When a rod of metal A is dipped in an aqueous solution of metal B (concentration of ` B^(2+) ` ion being 1 M) at `25^@ C`, the standard electrode potentials are `A^(2+) //A =- 0.76 ` volts, `B^(2+) //B= +0.34 ` volts .

Options

A. A will gradually dissolve
B. B will deposit on A
C. No reaction will occur
D. Water wil decompose into `H_(2) and O_(2)`

Answer

B

Explanation

Since `E_(A^(2+)//A)^(o) lt E_(B^(2+)//B)^(o)`. A has greater tendency to be oxidized.
`A+B^(2+)toA^(2+)+B`.