Ontario Operator-in-Training (OIT) Practice Exam

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Study for the Ontario Operator-in-Training (OIT) Test. Use flashcards and multiple-choice questions for preparation, with hints and explanations for each. Get ready for your exam!

Practice this question and more.

Which chemical is commonly used as an oxidant in water treatment processes?

Sodium Thiosulfate
Ammonium Sulfate
Hydrogen Peroxide
Calcium Carbonate

The correct answer is: Hydrogen Peroxide

Hydrogen peroxide is commonly used as an oxidant in water treatment processes due to its ability to react with and break down harmful contaminants. As a strong oxidizing agent, hydrogen peroxide effectively destroys bacteria, viruses, and other microorganisms, making it beneficial for disinfecting water. Additionally, it can help in the removal of organic materials, color, and taste from water, thereby improving overall water quality. The other chemicals listed do not serve the primary function of an oxidant in water treatment. Sodium thiosulfate, for example, is typically used as a reducing agent, particularly for dechlorination. Ammonium sulfate is primarily utilized as a nutrient in wastewater treatment, while calcium carbonate is used to adjust pH levels and control corrosion rather than acting as an oxidant. Thus, hydrogen peroxide is the appropriate choice for its oxidative properties in water treatment processes.