ACVPM Toxicology Practice Exam 2026 - Free Toxicology Practice Questions and Study Guide

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Which of the following is an inorganic mercury source?

Alkyl mercurials used as fungicides.

Elemental mercury used in thermometers.

Mercury comes in different chemical forms, and whether it’s inorganic or organic depends on its bonding. Inorganic mercury includes elemental mercury (Hg0) and mercury salts, while organic mercury contains mercury bonded to carbon, such as methyl or aryl groups. Alkyl mercurials and aryl mercurials are organomercury compounds because they have carbon-mercury bonds. Methyl mercury is also an organic mercury compound, not inorganic. Elemental mercury used in thermometers is the pure metal form, with no carbon attachment, so it is inorganic.

Aryl mercurials used as anti-mildew paints.

Methyl mercury is inorganic.