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What does an Acid produce when dissolved in water?

  1. a. A compound that In water produces hydrogen ions

  2. b. A type of Protozoan that has no permanent shape

  3. c. rain containing acids formed in the atmosphere

  4. d. The maximum value of a wave or vibration

The correct answer is: a. A compound that In water produces hydrogen ions

The correct answer focuses on the definition of an acid in a chemical context. When an acid is dissolved in water, it produces hydrogen ions (H⁺). This characteristic is fundamental to the behavior of acids and is part of the Brønsted-Lowry definition of acids, which states that an acid is a substance that can donate a proton (which is a hydrogen ion when it dissociates in water). The other options do not accurately describe what happens when an acid dissolves in water. Protozoans and wave characteristics are unrelated to acid behavior, and while acid rain can occur due to atmospheric processes, it does not specifically address the dissolution of an acid in water. Therefore, the option indicating the production of hydrogen ions directly relates to the properties and definitions of acids.