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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Determination of Chemical Oxygen Demand

Organic and oxidizable inorganic substances in the sample are oxidized by

a: Potassium chromate b: Potassium dichromate c: Potassium permanganate d: Potassium nitrate

What is the catalyst used?

a: Silver sulfate b: Mercuric sulfate c: Ferrous ammonium sulfate d: Ortho phenanthroline ferrous complex

The amount of oxygen consumed by sewage as a result of an oxidizing agent such as potassium dichromate is referred to as

a: Biochemical Oxygen Demand (BOD) b: Chemical Oxygen Demand (COD) c: Organic Oxygen Demand d: None of these

Reflux temperature is the temperature

a: At which the reaction is heated depends on the boiling points of the solvents b: At which the reaction is heated depends on the boiling points of the solute c: At which the reaction is heated depends on the boiling points of the solution d: At which the reaction is heated depends on the boiling points of the mixture

Chemical Oxygen demand (COD) measures the

a: Amount of oxygen required for growth of microorganisms in water b: Amount of oxygen required to oxidize the calcium present in waste water c: Amount of oxygen that would be removed from the water in order to oxidize pollution d: All of the above

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