Ontario Operator-in-Training (OIT) Practice Exam

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Question: 1 / 235

Trihalomethanes are produced when chlorine reacts with which type of materials?

Inorganic materials

Organic materials

Trihalomethanes are a group of chemical compounds that can form when chlorine, commonly used as a disinfectant in water treatment, reacts with organic materials present in water. These organic materials often include natural organic matter such as decaying plant material and microorganisms. The formation of trihalomethanes occurs because chlorine reacts with the hydrogen and carbon atoms found in these organic compounds. The chemical reaction leads to the substitution of chlorine atoms for hydrogen atoms, creating various trihalomethanes, which may pose health risks if present in drinking water above certain levels. In contrast, inorganic materials, heavy metals, and gases do not typically lead to the formation of trihalomethanes when combined with chlorine. Inorganic materials might react differently with chlorine but will not produce trihalomethanes. Heavy metals, such as lead or mercury, do not participate in this specific reaction, and gases like carbon dioxide or nitrogen do not have the necessary organic structure to form these compounds. Therefore, the correct answer identifies the organic materials as the source for trihalomethanes in chlorinated water.

Heavy metals

Gases

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