Which of the following reactions are redox re | vedclass

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(D) redox reaction involves a change in the oxidation state of atoms.$I.$ In $Cr_2O_7^{2-} + 2OH^- 	o 2CrO_4^{2-} + H_2O$,the oxidation state of $Cr$

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$II, III, IV$

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(D) redox reaction involves a change in the oxidation state of atoms.$I.$ In $Cr_2O_7^{2-} + 2OH^- 	o 2CrO_4^{2-} + H_2O$,the oxidation state of $Cr$ is $+6$ in both $Cr_2O_7^{2-}$ and $CrO_4^{2-}$. No change in oxidation state occurs,so it is not a redox reaction.$II.$ In $Zn + CuSO_4 	o ZnSO_4 + Cu$,$Zn$ is oxidized $(0 	o +2)$ and $Cu$ is reduced $(+2 	o 0)$. This is a redox reaction.$III.$ In $2MnO_4^- + 3Mn^{2+} + 4OH^- 	o 5MnO_2 + 2H_2O$,$Mn$ in $MnO_4^-$ is $+7$ and in $Mn^{2+}$ is $+2$. Both are reduced to $Mn$ in $MnO_2$ $(+4)$. This is a redox reaction (disproportionation/comproportionation).$IV.$ In $2Cu^+ 	o Cu + Cu^{2+}$,$Cu^+$ is both oxidized $(+1 	o +2)$ and reduced $(+1 	o 0)$. This is a disproportionation redox reaction.Therefore,reactions $II, III,$ and $IV$ are redox reactions.

Which of the following reactions are redox reactions?
$I. \, Cr_2O_7^{2-} + 2OH^- \to 2CrO_4^{2-} + H_2O$
$II. \, Zn + CuSO_4 \to ZnSO_4 + Cu$
$III. \, 2MnO_4^- + 3Mn^{2+} + 4OH^- \to 5MnO_2 + 2H_2O$
$IV. \, 2Cu^+ \to Cu + Cu^{2+}$

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Which of the following reactions are redox reactions?$I. \, Cr_2O_7^{2-} + 2OH^- \to 2CrO_4^{2-} + H_2O$$II. \, Zn + CuSO_4 \to ZnSO_4 + Cu$$III. \, 2MnO_4^- + 3Mn^{2+} + 4OH^- \to 5MnO_2 + 2H_2O$$IV. \, 2Cu^+ \to Cu + Cu^{2+}$