Final answer:
During a volcanic eruption, various gases and particles are released. While Sulphur dioxide, Ammonium chloride, and Hydrogen are commonly released, Thorium is not released.
Step-by-step explanation:
The correct answer is 3) Thorium
During a volcanic eruption, various gases and particles are released. Sulphur dioxide (SO2), Ammonium chloride (NH4Cl), and Hydrogen (H2) are commonly released during volcanic eruptions. However, Thorium (Th) is not released during volcanic eruptions as it is a radioactive element found in Earth's crust and is not typically volatilized during the eruption.
Learn more about Volcanic eruptions