Final answer:
Hydrogen occurs in the free state in volcanic acid and some natural gases. This statement is True.
Step-by-step explanation:
The presence of hydrogen in volcanic acid and natural gases can be attributed to various factors. For example, volcanic gases contain hydrogen sulfide (H2S), which is a compound of hydrogen and sulfur. Additionally, deep-sea hydrothermal vents, such as volcanic vents, release reducing molecules like hydrogen gas. Therefore, hydrogen can indeed be found in the free state in volcanic acid and some natural gases.