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Q.

One million grams of water sample containing organic waste require 98 grams of  K2Cr2O7/H+ to remove all the organic waste.COD of the water sample is

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Detailed Solution

COD is expressed in ppm of oxygen 49 grams (GEW) of K2Cr2O7/H+ = 8 grams (GEW) of oxygen106 grams of water require 98 grams of K2Cr2O7/H+; 106 grams of water require 16 grams of oxygen; COD = 16ppm
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