What are the sources of carbon monoxide and sulphur dioxide in air?

One litre of oxygen was added to one litre of a mixture of carbon monoxide and carbon dioxide. When the whole mixture was burnt, its volume decreased to 1.8 litres. Determine the volume percent of carbon monoxide and carbon dioxide in the mixture initially .

Carbon monoxide is not

What are the physical properties of carbon monoxide?

Acid rain is caused by release of __ and ___ into the air. A. Carbon dioxide and carbon monoxide B. Sulphur dioxide and nitrogen oxides C. Oxygen and water vapour D. Nitrous oxide and ozone