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Question

Name the process of conversion of K2Cr2O7 into Cr2(SO4)3.


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Solution

Reduction reaction:

  • Reduction is the process by which the oxidation number of any substance is reduced by the acceptance of electrons.
  • In a reduction reaction, there is acceptance of electrons or the addition of Hydrogen, or the removal of Oxygen.

Conversion of K2Cr2O7 into Cr2(SO4)3:

  • Conversion of K2Cr2O7 into Cr2(SO4)3takes place with the reduction process.
  • In this reaction, the Potassium Dichromate accepts electrons and is converted into Chromium Sulfate in an acidic medium by reduction.
  • Example: Potassium Dichromate gets reduced to Chromium Sulfate by undergoing a reaction with, Ferrous sulfate and Sulfuric acid as an acidic medium and in this process, it also oxidizes Ferrous sulfate to Ferric sulfate.
  • The reaction can be given as:K2Cr2O7PotassiumDichromate+6+7H2SO4Sulfuricacid+6FeSO4FerroussulfateK2SO4Potassiumsulfate+Cr2(SO4)3ChromiumSulfate+3+3Fe2(SO4)3Ferricsulfate+2H2Owater.
  • In the above reaction, Potassium Dichromate gets reduced to Chromium Sulfate, in which the oxidation state of Chromium changes from Cr+6toCr+3 by gaining three electrons.

Thus, the process of conversion of K2Cr2O7 into Cr2(SO4)3is reduction process.


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