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Three samples of water A,B and C have the D.O levels of 4ppm,and 3.8ppm and 2.1ppm respectively the most polluted sample of water is

$(a)\;Cannot\;be\;predicted\qquad(b)\;B\qquad(c)\;C\qquad(d)\;A$

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C
Hence (c) is the correct answer.
answered Jan 20, 2014 by sreemathi.v
 

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