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Question
Pick out the correct statement.
Options:
A .  Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water.
B .  COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time.
C .  COD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre.
D .  all (a), (b) and (c).
Answer: Option D
Answer: (d).all (a), (b) and (c).
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