Which entities give off carbon monoxide? choose exactly 2 answers that are correct. 1.plants 2.car exhaust 3.air that is exhaled 4.fireplaces

The right answers are 2. Car exhaust and 4. Fireplaces.

Car exhaust :

Since it is sometimes impossible to achieve "complete combustion" in combustion engines, the chemical composition of the exhaust gas differs significantly from the ideal composition, namely that "incomplete combustion" releases a mixture of hydrocarbons ( HC), the combustion temperatures being higher than 1400 ° C, some of the oxygen (O2) combines with the nitrogen (N) to form oxides. nitrogen (NOx).

Fireplaces:

Tous les conduits d’évacuation des gaz brûlés (conduit de cheminée, conduit d’évacuation de la chaudière…) doivent être ramonés chaque année par un professionnel, notamment avant la période de chauffe. Un conduit d’évacuation bouché risque d’entraîner un reflux du monoxyde de carbone à l’intérieur du logement.

the answer's are car exhaust and fireplaces i just took the test k12