Question

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

Answer 1

acts as a very strong oxidising agent in the acidic medium.

takes up electrons to get reduced and acts as an oxidising agent. The reaction of K₂Cr₂O₇ with other iodide, iron (II) solution, and H₂S are given below.

(i) oxidizes iodide to iodine.

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

(iii) oxidizes H₂S to sulphur.