Identify the reactions in which dichromate ac | vedclass

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(B) In reactions $I$ and $III$,dichromate acts as an oxidising reagent.$(I)$ $Cr_2O_7^{2-} + 6Fe^{2+} + 14H^{+} \longrightarrow 2Cr^{3+} + 6Fe^{3+} +

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$I, III$

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(B) In reactions $I$ and $III$,dichromate acts as an oxidising reagent.$(I)$ $Cr_2O_7^{2-} + 6Fe^{2+} + 14H^{+} \longrightarrow 2Cr^{3+} + 6Fe^{3+} + 7H_2O$In this reaction,$Cr^{6+}$ is reduced to $Cr^{3+}$ and $Fe^{2+}$ is oxidised to $Fe^{3+}$.$(II)$ $Cr_2O_7^{2-} + 2OH^{-} \longrightarrow 2CrO_4^{2-} + H_2O$In this reaction,there is no change in the oxidation state of $Cr$.$(III)$ $Cr_2O_7^{2-} + 6I^{-} + 14H^{+} \longrightarrow 2Cr^{3+} + 3I_2 + 7H_2O$In this reaction,$Cr^{6+}$ is reduced to $Cr^{3+}$ and $I^{-}$ is oxidised to $I_2$.$(IV)$ $Na_2Cr_2O_7 + 2KCl \longrightarrow K_2Cr_2O_7 + 2NaCl$In this reaction,no change in the oxidation state of $Cr$ occurs.

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