Given that the standard reduction potentials of the following half-cells are:
Ni²⁺/Ni = 0.25 V, Cu²⁺/Cu = 0.34 V,
Ag⁺/Ag = 0.80 V, and Zn²⁺/Zn = −0.76 V.
Which of the following reactions under standard conditions will not take place in the specified direction?

Question

Given that the standard reduction potentials of the following half-cells are:

Ni²⁺/Ni = 0.25 V, Cu²⁺/Cu = 0.34 V,

Ag⁺/Ag = 0.80 V, and Zn²⁺/Zn = −0.76 V.

Which of the following reactions under standard conditions will not take place in the specified direction?

TestHub · Accepted Answer

A reaction occurs spontaneously when E ce ll ∘ ​ > 0 . (a) E ce ll ∘ ​ = 0.25 − 0.34 = − 0.09 → not spontaneous (b) E ce ll ∘ ​ = 0.80 − 0.34 = + 0.46 → spontaneous (c) E ce ll ∘ ​ = 0 − 0.34 = − 0.34 → not spontaneous (d) E ce ll ∘ ​ = 0 − ( − 0.76 ) = + 0.76 → spontaneous Thus, (a) and (c) will not occur in the given direction.

Chemistry - Electrochemistry Question with Solution | TestHub

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