Half cell reactions for some electrodes are given below:
I. $A + e^{-} ⟶ A^{-}; E^{0} = 0.96 V$
II. $B^{-} + e^{-} ⟶ B^{2 -}; E^{o} = - 0.12 V$
III. $C^{+} + e^{-} ⟶ C; E^{o} = + 0.18 V$
IV. $D^{2 +} + {2 e}^{-} ⟶ D; E^{o} = - 1.12 V$

The largest potential will be generated in which cell?

A^{-} | A ∥ B^{-} | B^{2}

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D | D^{2 +} ∥ A | A^{-}

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B^{2} | B^{-} ∥ C^{+} | C

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D | D^{2 +} ∥ C^{+} | C

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Solution

The correct option is B $D | D^{2 +} ∥ A | A^{-}$

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Similar questions

Deduced from the following $E^{\circ}$ values of half cells, what combination of two half cells would result in a cell with the largest potential?
(i) $A^{3 -} \to A^{2 -} + e; E^{\circ} = 1.5 V$ (ii) $B^{2 +} + e \to B^{+}; E^{\circ} = 2.1 V$
(iii) $C^{2 +} + e \to C^{+}; E^{\circ} = + 0.5 V$ (iv) $D \to D^{2 +} + 2 e; E^{\circ} = - 1.5 V$