Question

Which of the folllwoing is not a triatomic molecule?

• A. Carbon dioxide
• B. Water
• C. Ozone
• D. Ammonia

Answer 1

The correct option is D Ammonia

Triatomic molecules are molecules made up of three atoms.
Carbon dioxide $\left(C{O}_2\right)$, water $\left(H_{2}O\right)$ and ozone $\left(O_3\right)$ are triatomic molecules. Ammonia $\left(N{H}_3\right)$ is made up of four atoms and hence is a tetraatomic molecule.