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Potassium dichromate oxidise
(hydrogen sulphide ) to sulphur (zero oxidation state)
![\\Cr_{2}O_{7}^{2-}+14H^{+}+6e^{-}\rightarrow 2Cr^{3+}+7H_{2}O\\ H_{2}S\rightarrow S + 2H^{+}+2e^{-}]\times 3](https://learn.careers360.com/latex-image/?%5C%5CCr_%7B2%7DO_%7B7%7D%5E%7B2-%7D+14H%5E%7B+%7D+6e%5E%7B-%7D%5Crightarrow%202Cr%5E%7B3+%7D+7H_%7B2%7DO%5C%5C%20H_%7B2%7DS%5Crightarrow%20S%20+%202H%5E%7B+%7D+2e%5E%7B-%7D%5D%5Ctimes%203)
The oxidising action of dichromate ion is -
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