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Question

Name the gas which turns acidified potassium dichromate paper to green.


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Solution

  1. Acidified potassium dichromate (K2Cr2O7) has an orange color.
  2. The orange color will turn green when it reacts with Sulphur dioxide(SO2).
  3. The reaction will result in the formation of Potassium sulphate (K2SO4) and Chromium sulphate (Cr2(SO4)3).
  4. The formation of Chromium sulfate(K2SO4) is the reason for the green color.
  5. The reaction is,K2Cr2O7+H2SO4AcidifiedPotassiumdichromate+3SO2K2(SO4)Potassiumsulphate+H2O+Cr2(SO4)3
  6. So, the gas is Sulfur dioxide.

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