During oxidation of ferrous sulphate using mixture of dill. H2SO4 and potassium dichromate; oxidation state of chromium change form
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The oxidising agent used in these reactions is normally a solution of sodium or potassium dichromate(VI) acidified with dilute sulphuric acid. If oxidation occurs, the orange solution containing the dichromate(VI) ions is reduced to a green solution containing chromium(III) ions
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During oxidation of ferrous sulfate using mixture of dil. H2SO4 and potassium dichromate, the oxidation state of chromium change form (+6) in potassium dichromate to (+3) in chromium(III) ion.
- Ferrous sulfate is oxidized to ferric sulfate,i.e the oxidation state of iron changes from (2) to (3).
- Dil. H2SO4 provides an acidic medium for the reaction to proceed.
- Potassium dichromate acts as an oxidizing agent and haence is reduced to Chromium(III) ions which renders the resulting solution its green colour.
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