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AP EAMCET202422 May 2024Morning ShiftChemistryEnvironmental ChemistryActual

Which of the following is/are estimated by titrating polluted water with potassium dichromate solution in acidic medium? array |c|c|c| COD & BOD & DO I & II & III array

Options

  1. AI only
  2. BII only
  3. CII & III only
  4. DI,II,III

Correct answer

A. I only

Step-by-step solution

The COD (chemical oxygen demand) test is widely used as an alternative to BOD test 10 estimate the strength of domestic and industrial waste as COD test can give result in few hours as compared to BOD (Biological Oxygen Demand) test which takes normally 5 days. It use potassium dichromate ( K ₂ Cr ₂ O ₇ ) in pressure of concentrated sulphuric acid ( H ₂ SO ₄ ) solution and that oxidizes both organic and inorganic substance in a waste water sample.

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