Polluted air contains oxides of nitrogen. Which statement about oxides of nitrogen is true?
- AOxides of nitrogen are formed by the reaction of nitrogen with oxygen during the fractional distillation of liquid air.
- BOxides of nitrogen are formed in a car engine by the reaction of petrol with nitrogen from the air.
- COxides of nitrogen are removed from exhaust gases by reaction with carbon dioxide in a catalytic converter.
- DOxides of nitrogen are removed from exhaust gases by reduction in a catalytic converter.