SELECT * FROM question_mgmt as q WHERE id=2103 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=63 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Describe the oxidising action of potassium dichromate and write the ionicequations for its reaction with:

(i) iodide

(ii) iron

(II) solution and

(iii) H2S

Answer:

K2Cr2O7 acts as a very strong oxidising agent in the acidic medium.

K2Cr2O7    +    4H2SO4   →    K2SO4   + Cr(SO4)3  +  4H2O   +  3[O]   

K2Cr2O7 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.


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