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Given the possible BOD values of clean w...

Given the possible BOD values of clean water and the polluted water.

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`to` The BOD value of clean water is less than 3 ppm.
`to` The BOD value of water is greaterthan 4 ppm then it is said to be polluted .
`to` Highly polluted water has BOD value more than 17 ppm.
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The amount of oxygen used by the suitable microorganisms present in water during five days at 20^(@)C is called as BOD. For pure water BOD is about 1 ppm fairly pure water 3 ppm and doubtful purity 5 ppm the municipal sewage has BOD values 100-4000 ppm. BOD= Number of moles of O_2 required / Number of liters of water sample The BOD values of three water sample x,y and z are 5 mg/litre, 16 mg/Litre and 400 mg/Litre respectively the more polluted sample of water is