In the diagram given below the value of 'X' is:

0.325 V

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0.65 V

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- 0.35 V

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- 0.65 V

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Solution

The correct option is A 0.325 V
Given, $C u^{2 +} + e^{-} \to C u^{+}; E_{1}^{0} = 0.15 V$
$∴ Δ G_{1}^{0} = - 1 \times 0.15 \times F = - 0.15 F$
Again,
$C u^{+} + e^{-} \to C u; E_{2}^{0} = - 0.5 V$
$∴ Δ G_{2}^{0} = - 1 \times 0.50 \times F = - 0.5 F$
Now,
$C u^{+ 2} + 2 e^{-} \to C u; E_{3}^{0} = ? ∴ Δ G_{3}^{0} = - 2 \times E_{3}^{0} \times F = - 2 E_{3}^{0} F A l s o, Δ G_{3}^{0} = Δ G_{1}^{0} + Δ G_{2}^{0} = - 0.15 F - 0.5 F \Rightarrow - 2 E_{3}^{0} F = - 0.65 F o r E_{3}^{0} = \frac{0.65}{2} = 0.325 V$

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