Question

The following statements regarding characteristic of carbon dioxide $\left(C{O}_2\right)$ are true except that it is:

• A. It is a colourless gas.
• B. It is lighter than air.
• C. It is an odourless gas.
• D. It does not support combustion.

Answer 1

The correct option is B

It is lighter than air.

The characteristics of carbon dioxide are:

(1) It is a colourless gas.

(2) It is an odourless gas. It has no distinct smell like some other gases like ammonia which is known for its pungent smell.

(3) It does not support combustion. Therefore, it is used in fire extinguishers to put off fire.

(4) $C{O}_2$ is denser than air.