The positive value of the standard electrode potential of `Cu^(2+)//Cu` indicates that ____

Options

A. this redox couple is a stronger reducing agent than the `H^(+)//H_(2)` couple.
B. this redox couple is a stronger oxidising agent than `H^(+)//H_(2)`.
C. Cu can displace `H_(2)` from acid.
D. Cu cannot displace `H_(2)` from acid.

Answer

B, D

Explanation

* `(E_(H^(+)|H_(2))^(Theta)) lt (E_(Cu^(2+)|Cu)^(Theta))`
So following reaction is possible.
`Cu_((aq))^(2+)+H_(2(g)) to Cu_((S)) +2H_((aq))^(+)`
* Here, hydrogen is oxidized and `Cu^(2+)|Cu` is strong oxidizing agent.
* The electrode having more `E^(@)` value will act as strong oxidizing agent. Cu does not get oxidized in this reaction. Cu does not replace `H_(2)` from the acid.
* Lower the value of standard reduction potential higher will be the reducing power.