From the following E o values of half cells, what combination of two half cells would…

Chemistry · JEE Main · NTA Exams — Redox Reactions and Electrochemistry

From the following E^o values of half cells, what combination of two half cells would result in a cell with lowest potential?

\(\mathbf{X}+\mathbf{e}^{-} \longrightarrow \mathbf{X}^{-}: E^{\square}=-0.24 \mathrm{~V}\)
\(Y^{-}+\mathbf{e}^{-} \longrightarrow Y^{2-}: \quad E^{0}=+1.25 \mathrm{~V}\)
\(\mathrm{Z}^{-}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Z}^{3-}: \mathrm{E}^{0}=-1.25 \mathrm{~V}\)
\(\mathbf{W}+2 \mathbf{e}^{-} \longrightarrow \mathbf{W}^{2-} ; E^{\mathbf{0}}=+0.68 \mathrm{~V}\)

Answer

(D) I and IV

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