8.15    Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:

               (i) iodide

 

 

 

Answers (1)

Potassium dichromate (K_{2}Cr_{2}O_{7}) act as a strong oxidising agent in acidic medium. It takes the electron to get reduced.
(K_{2}Cr_{2}O_{7}) oxidises iodide to iodine

\\Cr_{2}O^{2-}_{7}+14H^{+}+6e^{-}\rightarrow 2Cr^{3+}+7H_{2}O\\ 2I^{-}\rightarrow I_{2}+2e^{-}]\times 3\\ ----------------------\\ Cr_{2}O^{2-}_{7}+14H^{+}+6I^{-}\rightarrow 2Cr^{3+}+3I_{2}+7H_{2}O
In first reaction oxidation state of chromium reduced from +6 to +3  

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