8.25 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

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8.25 K₂Cr₂O₇ acts as a very strong oxidizing agent in acidic medium. K₂Cr₂O₇ gets reduced and acts as an oxidizing agent by oxidizing Iodide to iodine

(i) K₂Cr₂O₇ oxidizes iodide to iodine

Cr₂O₇^2-+ 14H⁺+ 6e^-→ 2Cr³⁺ + 7H₂O

2I^-→ I₂ + 2e^- } x3

Overall: Cr₂O₇^2-+ 14H⁺+ 6I^-→ 2Cr³⁺ + 7H₂O+ 3I₂

(ii) K₂Cr₂O₇ oxid

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8.25 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

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