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Which of the following is the biggest limitation of the COD test?

78. Which of the following is the biggest limitation of the COD test?

1. The time required for the COD test is long and less arbitrary.
2. The test is applicable only in the case of biodegradable organic matter.
3. The test cannot differentiate between biologically active and inactive organic matter.
4. A high concentration of active Bacteria is required to be present in the sample of sewage

Answer: C) The test cannot differentiate between biologically active and inactive organic matter

Explanation:

The biggest limitation of the COD test is that the test cannot differentiate between biologically active and inactive organic matter.