From the following $$E^{\circ}$$ values for the half-cells:

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

$$(iii)$$ and $$(iv)$$

$$(ii)$$ and $$(iv)$$

$$(i)$$ and $$(iii)$$

$$(i)$$ and $$(iv)$$

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Solution

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Correct option is A. $$(i)$$ and $$(iii)$$

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From the following $$E^{\circ}$$ values for the half-cells:

$$(i)\ D\rightarrow D^{2+}+2e^{-};E^{\circ}=-1.5V$$

$$(ii)\ B^{+}+e^{-}\rightarrow B;E^{\circ}=-0.5V$$

$$(iii)\ A^{3-}\rightarrow A^{2-}+e^{-};E^{\circ}=1.5V$$

$$(iv)\ C^{2+}+e^{-}\rightarrow C^{+};E^{\circ}= +0.5V$$

Which combination of two half-cells would result in a cell with the largest potential?

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Deduce from the following

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value of half cells, What combination of half cells would result in cell with the largest potential?
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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

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What combination of two half cells would result in a cell with the largest potential?

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Deducted from the following

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A^{3 -} \to A^{2 -} + e; E^{o} = 1.5 V

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What combination of two half cells would result in a cell with the largest potential?

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