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(A) The $COD$ (Chemical Oxygen Demand) is estimated by titrating a polluted water sample with a strong oxidizing agent,potassium dichromate $(K_2Cr_2O

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$I$ only

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(A) The $COD$ (Chemical Oxygen Demand) is estimated by titrating a polluted water sample with a strong oxidizing agent,potassium dichromate $(K_2Cr_2O_7)$,in the presence of concentrated sulphuric acid $(H_2SO_4)$.This process oxidizes both organic and inorganic substances present in the water sample.$BOD$ (Biological Oxygen Demand) is measured by the amount of oxygen consumed by microorganisms over $5 \ days$,while $DO$ (Dissolved Oxygen) is measured using the Winkler method.

Which of the following is/are estimated by titrating polluted water with potassium dichromate solution in acidic medium?

$COD$ $BOD$ $DO$

$I$ $II$ $III$

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