Consider the following transformation 2 CuX_ | vedclass

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(C) The reaction $2 \ CuX_2 \rightarrow Cu_2X_2 + X_2$ represents the reduction of $Cu^{2+}$ to $Cu^{+}$ by the halide or pseudohalide ion $X^{-}$.Thi

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$CN^{-}, I^{-}$

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(C) The reaction $2 \ CuX_2 \rightarrow Cu_2X_2 + X_2$ represents the reduction of $Cu^{2+}$ to $Cu^{+}$ by the halide or pseudohalide ion $X^{-}$.This reaction occurs spontaneously at room temperature when $X^{-}$ is a strong reducing agent,such as $I^{-}$ or $CN^{-}$.In the case of $Cl^{-}$ and $Br^{-}$,the reduction of $Cu^{2+}$ to $Cu^{+}$ is not strong enough to occur at room temperature,and $F^{-}$ is not a reducing agent at all.

Consider the following transformation $2 \ CuX_2 \xrightarrow[\text{Room}]{\text{temp.}} Cu_2X_2 + X_2 \uparrow$. Then $X^{-}$ can be:

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