QJEEM20Chdcf4: JEE Main 2020 Chemistry - Class 12 JEEM20Chdcf4 Solution: Given that the standard potentials (E o ) of Cu 2+ /Cu and Cu + …

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Given that the standard potentials (E^o) of Cu²⁺/Cu and Cu⁺/Cu are 0.34 V and 0.522 V respectively, the E^o of Cu²⁺/Cu⁺ :

Accepted Answer

Cu⁺² + 2e^–

\to

Cu E^o = 0.34 V ....(1)

Cu⁺ + e^–

\to

Cu E^o = 0.522 V

Cu

\to

Cu⁺ + e^– E^o = -0.522 V ...(2)

By adding (1) and (2) we get,

Cu⁺² + e^–

\to

Cu⁺

E^o_cell =

{{0.34 \times 2 + 1 \times \left( { - 0.522} \right)} \over 1}

= 0.158 V

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