Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Biological oxygen demand (BOD)
Oxygen ion concentration
Bacterial stability factor
Relative stability

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Environmental Engineering in CE
Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

Conversion of NOx into N₂ and NH₃ in the first compartment
All of these
Oxidation of unburnt hydrocarbon fuel in the second compartment
Conversion of CO into CO₂ in the second compartment

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