Question

Which of the following are true about carbon dioxide?

• A. It's odourless
• B. It's colourless
• C. It's acidic
• D. It's insoluble in water

Answer 1

Answer: (A), (B), (C)

It's acidic

Carbon dioxide $\left(C{O}_2\right)$ gas is a colourless and odourless gas.
It is an acidic oxide as it can change a wet blue litmus red.
Also, when added to water, it dissolves and produces carbonic acid $\left(H_{2}C{O}_3\right)$ as shown below-

${\mathrm{CO}}_2\left(g\right)+H_{2}O\left(l\right)\to H_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)\mathrm{Carbon}\mathrm{Water}\mathrm{Carbonic}\mathrm{acid}\mathrm{dioxide}$

Carbonic acid is widely is used in manufacturing soft drinks.