Standard electrode potentials for a few half cells are mentioned below : E Cu 2 + / Cu ∘ = 0.34 V , E Zn 2 + / Zn ∘ = − 0.76 V E Ag + / Ag ∘ = 0.80 V , E Mg 2 + / Mg ∘ = − 2.37 V Which one

Question

Standard electrode potentials for a few half cells are mentioned below : ​ E Cu 2 + / Cu ∘ ​ = 0.34 V , E Zn 2 + / Zn ∘ ​ = − 0.76 V E Ag + / Ag ∘ ​ = 0.80 V , E Mg 2 + / Mg ∘ ​ = − 2.37 V ​ Which one of the following cells gives the most negative value of Δ G ∘ ?

TestHub · Accepted Answer

∵ Δ G ∘ = − nFE ∘ Option ( 1 ) E ∘ = 0.8 + 0.76 = 1.56 V ∴ Δ G ∘ = − 2 × F × 1.56 = − 3.12 V Option (2) E ∘ = − 2.37 + 0.76 = − 1.61 V ∴ Δ G ∘ = − 2 × F × ( − 1.61 ) = + 3.22 V Option (3) E ∘ = − 2.37 − 0.8 = − 3.17 V Δ G ∘ = − 2 ​ ) × F × ( − 3.17 ) = + 6.34 Option ( 4 ) E ∘ = 0.8 − 0.34 = 0.46 V Δ G ∘ = − 2 × F × 0.46 = − 0.92 V ​

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