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Question
Which of the following chemical parameters are associated with the organic content of water? 
1. Biological Oxygen Demand (BOD) 
2. Chemical Oxygen Demand (COD) 
3. Total Organic Carbon (TOC) and Total Oxygen Demand (TOD)
A.
1 and 2 only
B.
1 and 3 only
C.
2 and 3 only
D.
1, 2 and 3
Answer ( Option D)

1, 2 and 3

Solution

BOD, COD, TOC and TOD all are associated with organic content of water. 
COD is related to both inorganic and organic content of water.

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