1) The equilibrium $2Cu^{1} \rightleftharpoons Cu^{0}+Cu^{II}$ in aqueous medium at 25 °C shifts towards the left in the presence of A) $NO_{3}^{-}$ B) $Cl^{-}$ C) $SCN^{-}$ D) $CN^{-}$ Answer: Option B,C,DExplanation:$Cl^{-},CN^{-}$ and $SCN^{-}$ forms precipitate with Cu(I), remove Cu(I) ion from equilibrium and reaction shifts in direction shift in the backward direction according to Le-Chatelier's principle
