Question

carbon monoxide is a colorless, odorless, tasteless,______, and highly toxic gas.

a. flammable
b. nonflammable
c. high - temperature
d. low - temperature

Explanation:

Carbon monoxide (\(CO\)) is a well - known flammable gas. It can react with oxygen (\(O_2\)) in the air under appropriate conditions (such as the presence of a spark or in a combustion environment) according to the chemical equation \(2CO + O_2\xlongequal{ignition}2CO_2\). Options b (non - flammable) is incorrect as we know from its chemical reactivity. Options c (high - temperature) and d (low - temperature) are not relevant physical properties to describe carbon monoxide in this context of gas property listing (colorless, odorless etc. are physical property descriptions and flammability is also a physical property related to its behavior in the presence of fire).

Answer:

A. Flammable