Q98.
Consider the following statements: 1. Other than those made by humans, nanoparticles do not exist in nature. 2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics. 3. Nanoparticles of some commercial products which enter the environment are unsafe for humans. Which of the statements given above is/are correct?
Answer
D
Explanation
Statement 1 is incorrect: Nanoparticles occur widely in NATURE. A significant fraction of interplanetary dust, atmospheric dust, many viruses, and minerals like iron oxides/sulfides, silver, and gold are naturally-occurring nanoparticles in the environment. Statement 2 is correct: Many cosmetic products use nanotechnologies — titanium dioxide and zinc oxide nanoparticles are common ingredients for sun protection; silver and gold nanoparticles add antimicrobial properties. Statement 3 is correct: Consumers are exposed to nanomaterials during usage of commercial products, which may lead to harmful and toxic effects.