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Home » Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:(i) iodide (ii) iron(II) solution and (iii) H2S
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
(i) iodide (ii) iron(II) solution and (iii) H2S
CBSE | Class 12 | NCERT | The d & f Block Elements
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
(i) iodide (ii) iron(II) solution and (iii) H2S

In acidic medium, K2Cr2O7​ behaves as a very strong oxidising agent.

    \[{K_2}C{r_2}{O_7} + 4{H_{2}}S{O_4} \to {K_2}S{O_{4}} + C{r_{2}}{(S{O_4})_{3}} + 4{H_2}O + 3[O]\;\]

​K2Cr2O7 gains electrons to get reduced and behaves as an oxidizing agent. The reaction of K2Cr2O7 with H2S, iron (II) solution and other iodide are as follows:

(i) K2Cr2O7 ​ oxidizes iodide to iodine.

(ii) K2Cr2O7 oxidizes iron (II) solution to iron (III) solution i.e., ferrous ions to ferric ions.

K2Cr2O7 oxidizes H2S to sulphur.

i

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