The dissolved oxygen level in natural unpolluted waters at normal temp – McqOptions

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1.	The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of%!
A.	1 mg/liter
B.	10 mg/liter
C.	100 mg/liter
D.	1000 mg/liter
Answer» C. 100 mg/liter

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