PSI Barbering Practice Exam

The presence of soap in most disinfectants will cause them to become ______.

1. Inactive

2. Active

3. Foamy

4. Stronger

The correct answer is: Inactive

The presence of soap in most disinfectants can cause them to become inactive. This is due to the fact that soap can react with the active ingredients in the disinfectant, potentially neutralizing their effectiveness. Disinfectants are designed to kill pathogens, and when soap is present, it can interfere with the disinfectant's ability to do so by forming micelles that trap the active ingredients, leading to reduced efficacy. In the context of the other options, being "active" might imply that the disinfectant would work better, which is not the case when soap is present. "Foamy" suggests an increase in lather, which does not contribute to disinfection and may instead hinder the desired effect. The idea of being "stronger" also inaccurately indicates that soap contributes to a more potent disinfectant solution, rather than demonstrating that it can diminish the disinfectant's capability to sanitize surfaces effectively.