First slide

Water pollution , major water pollutants

Question

BOD of water is expressed in ppm of Oxygen. BOD of 100 kg water sample which requires 490 mg of acidified potassium dichromate to oxidize all the microorganisms will be

Moderate

A

1.6ppm
B

0.8ppm
C

80ppm
D

16ppm

Solution

$GEW of K_{2} {Cr}_{2} O_{7} / H^{+} = 49 g; GEW of O_{2} = 8 g; 49 g of K_{2} {Cr}_{2} O_{7} / H^{+} = 8 g of O_{2}; 49 mg of K_{2} {Cr}_{2} O_{7} / H^{+} = 8 mg of O_{2}; 10^{5} g of water - 80 mg of O_{2} 10^{6} g of water - 800 mg of O_{2} BOD of water = 0.8 g = 0.8 ppm$

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