1.

Prove that acidified potassium dichromate is a powerful oxidising agent.

Answer»

Solution :`K_(2)Cr_(2)O_(7)` ACT as power oxidising agent in acidic medium. In the presence of `H^(+)` ions, the oxidation state of Cr froms `Cr^(6+)` is changed to `Cr^(3+)`
`Cr_(2)O_(7)^(2-)+ 14H^(+) + 6E^(-) to2Cr^(3+) + 7H_(2)O`
Example: ACIDIFIED `K_(2)Cr_(2)O_(7)` oxidises Ferrous salts to Ferric salts.
`Cr_(2)O_(7)^(2-)+ 6Fe^(2+) + 14H^(+) to2Cr^(3+) + 6Fe^(3+) + 7H_(2)O`


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