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Describe the oxidising action of potassi...

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with
(i) iodide
(ii) iron (II) solution and
(iii) `H_(2)S`.

Text Solution

Verified by Experts

Potassium dichromate is a strong oxidising agent. In acidic solution, its oxidising action may be represented as :
`Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-) to 2Cr^(3+)+7H_(2)O`
Ionic equations
(i) Reaction of `K_(2)Cr_(2)O_(7)` with `I^(-)`
`Cr_(2)O_(7)^(2-)+14H^(+)+6I^(-) to 2Cr^(3+)+3I_(2)+7H_(2)O`
(ii) Reaction of `K_(2)Cr_(2)O_(7)` with `Fe^(2+)(aq)`
`Cr_(2)O_(7)^(2-)+14H^(+)+6Fe^(2+) to 2Cr^(3+)+6Fe^(3+)+7H_(2)O`
(iii) Reaction of `K_(2)Cr_(2)O_(7)` with `H_(2)S`
`Cr_(2)O_(7)^(2-)+8H^(+)+3H_(2)S to 2Cr^(3+)+3S+7H_(2)O`
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