Question

q11. which of the following is a high - level disinfectant?
quaternary ammonium compounds
ortho - phthalaldehyde (opa)
isopropyl alcohol
hydrogen peroxide

Explanation:

• Quaternary ammonium compounds are low - level disinfectants.
• Isopropyl alcohol is a low - to intermediate - level disinfectant.
• Hydrogen peroxide can be a high - level disinfectant when used at appropriate concentrations (e.g., 35% hydrogen peroxide gas plasma for sterilization, but as a liquid, higher concentrations like 6% can be high - level disinfectants). However, ortho - phthalaldehyde (OPA) is a well - known high - level disinfectant. It is used in healthcare settings for disinfecting semi - critical medical devices. OPA has good activity against a wide range of microorganisms including bacteria, viruses, and mycobacteria.

Answer:

Ortho - phthalaldehyde (OPA)