Red Seal Plumbing Complete 2025 Practice Exam

Some acid drain cleaners may react with the water in the drain to produce hydrochloric acid. This reaction occurs when the drain cleaner, which may contain another strong acid such as sulfuric or nitric acid, comes into contact with water. However, it is important to note that this is not the case for all acid drain cleaners. Some may not react with water at all, while others may produce a different acid such as acetic acid. Therefore, options A, B, and D are incorrect because they do not necessarily reflect the specific reaction of acid drain cleaners with water in drains.