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Consider the following transformation :
\( 2 \mathrm{Cu} X_{2} \stackrel{\text { Room temperature }}{\longrightarrow} 2 \mathrm{CuX}+X_{2} \uparrow \)
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Then \( X^{-} \)can be :
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(a) \( \mathrm{F}^{-}, \mathrm{Br}^{-} \)
(b) \( \mathrm{Cl}^{-}, \mathrm{Br}^{-} \)
(c) \( \mathrm{CN}^{-}, \mathrm{I}^{-} \)
(d) \( \mathrm{Cl}^{-}, \mathrm{F}^{-} \)
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