Question

_____________is a colourless gas of about the same density of air.

(a) Carbon monoxide

(b) Hydrocarbons

(c) Oxides of nitrogen

(d) All of the mentioned

I had been asked this question in unit test.

Query is from Engine Emissions in chapter Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) Carbon monoxide

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is of about the same density as air. It is produced during incomplete combustion of carbon-containing fuels.