The standard reduction potentials of Zn and Ag in water at 298K are.
`Zn^(2+)+2e^(-)hArrZn,E^(@)=-0.76V` and
`Ag^(+)+e^(-)hArrAg:E^(@)=+0.80V`
Which of the following reactions take place?

Options

A. ` Zn^(2+)(aq)+Ag^(+)(aq)rarrZn(s)+Ag(s)`
B. `Zn(s)+Ag(s)rarrZ^(2+)(aq)+Ag^(+)(aq)`
C. `Zn^(2+)(aq)+2Ag(s)rarr2Ag^(+)(aq)+Zn(s)`
D. `Zn(s)+2Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag(s)`

Answer

D

Explanation

More the R.P. easier to reduce. Thus `Ag^(+)` will be reduced and Zn will be oxidised.
`Zn(s)+2Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag(s)`