Chemical and Ionic Equilibrium - Result Question 31

####31. The equilibrium $2 Cu^{I} \rightleftharpoons Cu^{0}+Cu^{II}$ in aqueous medium at $25^{\circ} C$ shifts towards the left in the presence of

(2011)

(a) $NO _3^{-}$

(b) $Cl^{-}$

(c) $SCN^{-}$

(d) $CN^{-}$

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Solution:

  1. $Cl^{-}, CN^{-}$and $SCN^{-}$forms precipitate with $Cu(I)$, remove $Cu$ (I) ion from equilibrium and reaction shifts in backward direction according to Le-Chatelier’s principle.


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