Three water samples were collected; drinking water, untreated sewage water and secondary effluent. The samples were labelled A, B and C but laboratory attendant did not note the source of sample. The BOD values of the samples recorded is 
and 
respectively. Using this data, select the correct source of water for the labels 
and C
Text Solution
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The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water. The greater the BOD of waste water more is its polluting potential. Out of the above three samples, sample C is the most polluted, i.e., untreated sewage water, since it has the maximum BOD value of 
. After untreated sewage water, secondary effluent discharge from a sewage treatment plant is most polluted. Thus, sample A is secondary effluent discharge from a sewage treatment plant and has the BOD value of 20 
, while sample 
is drinking water and has the 
value of 
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