Identify the reactions in which dichromate ac | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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+} +

Vedclass · Accepted Answer

$I, III$

Vedclass · Answer

(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.

Similar Questions

Identify the incorrect statement.

On heating $Mn(OH)_2$ with $PbO_2$ and conc. $HNO_3$,a pink colour is obtained due to the formation of:

Which one of the following,when dissolved in water,gives a coloured solution in a nitrogen atmosphere?

Indicate the steps in the preparation of:
$(i)$ $K_2Cr_2O_7$ from chromite ore.
$(ii)$ $KMnO_4$ from pyrolusite ore.

Among the following,the compound that is both paramagnetic and coloured is

Vedclass Test Series

Exam Paper Generator

Online Exam Module