Q. Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statements is not true
A) A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant
B) Chlorine and iodine are used as strong disinfectants
C) Dilute solutions of boric acid and hydrogen peroxide are strong antiseptics
D) Disinfectants harm the living tissues
Explanation
[Solution from source] Dilute boric acid and dilute hydrogen peroxide are weak (mild) antiseptics, so calling them strong is not true. The other statements are correct: 0.2% phenol is an antiseptic and 1% a disinfectant, chlorine and iodine are strong disinfectants, and disinfectants harm living tissue. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.