Which of the following is a disproportionation reaction?....

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Which of the following is a disproportionation reaction?
\( \mathrm{P} \)
(1) \( \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{H}^{+} \rightarrow \mathrm{Cu}+\mathrm{Cu}^{2+}+\mathrm{H}_{2} \mathrm{O} \)
(2) \( 2 \mathrm{CrO}_{4}^{2-}+2 \mathrm{H}^{+} \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{H}_{2} \mathrm{O} \)
(3) \( \mathrm{CaCO}_{3}+2 \mathrm{H}^{+} \rightarrow \mathrm{Ca}^{2+}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \)
(4) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+2 \mathrm{OH}^{-} \rightarrow 2 \mathrm{CrO}_{4}^{2-}+\mathrm{H}_{2} \mathrm{O} \)


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