Nitrogen dioxide is a gas that contributes to air pollution. It is produced in internal combustion engines.
Which statement is correct?
Nitrogen dioxide acts as a catalyst in the atmospheric oxidation of sulfur dioxide to sulfur trioxide.
2 )
Nitrogen dioxide reacts to form nitrogen monoxide in the catalytic converter of a car exhaust system.
3 )
PAN forms when nitrogen dioxide reacts with the gases formed by complete combustion of the fuel.
4 )
Under high pressure in an internal combustion engine, nitrogen dioxide forms from impurities in the fuel.
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