Which is/are correct among the following? Given the half cell EMFs
`E_(Cu^(2+)//Cu)^(@)=0.337V, E_(Cu^(+)|Cu)^(@)=0.521V`

Options

A. `Cu^(+1)` disproportionates.
B. Cu and `Cu^(2+)` comproportionates (reverse of disproportionation into `Cu^(+)`).
C. `E_(Cu|Cu^(+2))^(0)+E_(Cu^(+1)|Cu)^(0)` is positive
D. All of these

Answer

A,B,C

Explanation

`({:(Cu^(+)toCu^(2+)+Cu),(E_("cell")^(0)=E_(Cu^+|Cu^(+2))^(0)+E_(Cu^+|Cu)),(1e^(-)+Cu^(+)toCu),(Cu to Cu^(2+)+2e^(-)):})/({:Cu^+ toCu^(+2)+1e^(-):})`
`E_(Cu^(+)|Cu^(2+)=1xx0.521-2xx0.337=-0.153`
`E_(cell)^0=-0.153+0.521=0.368` reaction is spontaneous