Which of the following is a liquid chemical ('cold') sterilizing agent?

Which of the following is a liquid chemical ('cold') sterilizing agent?

• A. Hydrogen peroxide
• B. Ethylene oxide
• C. Alcohol
• D. Sterile saline

Answer: (A)

Cold sterilization uses chemical agents that can sterilize at room temperature without heat. Hydrogen peroxide fits this, because when used in appropriate liquid concentrations and contact times, it can achieve sterilization of heat‑sensitive equipment without applying heat. Ethylene oxide is a sterilant, but in gaseous form, not a liquid. Alcohol is mainly a disinfectant and does not reliably achieve sterilization, especially against spores. Sterile saline is simply a sterile fluid and does not act as a sterilizing agent.

Cold sterilization uses chemical agents that can sterilize at room temperature without heat. Hydrogen peroxide fits this, because when used in appropriate liquid concentrations and contact times, it can achieve sterilization of heat‑sensitive equipment without applying heat. Ethylene oxide is a sterilant, but in gaseous form, not a liquid. Alcohol is mainly a disinfectant and does not reliably achieve sterilization, especially against spores. Sterile saline is simply a sterile fluid and does not act as a sterilizing agent.