The equilibrium \( 2 \mathrm{Cu}^{\mathrm{I}} \rightleftharpoons \mathrm{Cu}^{0}+\mathrm{Cu}^{\m...

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The equilibrium \( 2 \mathrm{Cu}^{\mathrm{I}} \rightleftharpoons \mathrm{Cu}^{0}+\mathrm{Cu}^{\mathrm{II}} \) in aqueous medium at \( 25^{\circ} \mathrm{C} \) shifts towards the left in the presence of
(a) \( \mathrm{NO}_{3}^{-} \)
(b) \( \mathrm{Cl}^{-} \)
(c) \( \mathrm{SCN}^{-} \)
(d) \( \mathrm{CN}^{-} \)
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