Question

Photolysis of water releases ........... gas.

• A. ${CO}_2$
• B. $O_2$
• C. ${NH}_3$
• D. ${CH}_3$

Answer 1

The correct option is B $O_2$

Photolysis, the chemical process by which molecules are broken down into smaller units through the absorption of light.

Photolysis of water is the process by which water is split into H+, oxygen, and electrons in the presence of light.

So the answer is 'O2'.