Question

20(g) Replace the following with a word or a phrase.

a poisonous gas gave out from the exhaust pipes of cars

Answer 1

Carbon dioxide is a poisonous gas given out from the exhaust pipes of cars.

• Carbon monoxide $\left(\mathrm{CO}\right)$ is emitted as a waste product from the exhaust system of automobiles due to the incomplete combustion process that occurs in an engine.
• Carbon monoxide affects the number of greenhouse gases in the atmosphere, which is linked to climate change and global warming.