Chemistry
The BOD values of water indicate the

Amount of organic debris
Amount of oxygen used for biochemical oxidation
Amount of ozone used for biochemical oxidation
Amount of oxygen used for biochemical reduction

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Chemistry
What are the components responsible for acid rain?

Nitrogen monoxide (NO) and Carbon monoxide (CO)
Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)
Oxides of carbon (COx) and Oxides of nitrogen (NOx)

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