Here is Question No. 98 a part of our series on UPSC Prelims 2022
Q98. Consider the following statements:
- Other than those made by humans, nanoparticles do not exist in nature.
- Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics.
- Nanoparticles of some commercial products that enter the environment are unsafe for
humans.
Which of the statements given above is/are correct?
a) 1 only
b) 3 only
c) 1 and 2
d) 2 and 3
Answer – D
- Statement 1 is incorrect: Naturally occurring nanoparticles can be found in volcanic ash, ocean spray, fine sand and dust, and even biological matter (e.g. viruses).
- Statement 2 is correct: The cosmetics are formulated by using different types of metal and metal oxide nanoparticles such as silver nanoparticles (AgNPs), gold nanoparticles (AuNPs) and titanium dioxide nanoparticles (TiO2 NPs), zinc oxide nanoparticles, (ZnO NPs), iron oxide nanoparticles, (Fe2O3 NPs) and carbon-based NPs.
- Statement 3 is correct: One of the crucial issues that have to be addressed in the near future, before the massive fabrication of nanomaterials,is their toxicity to humans and impact on the environment. Plastic soup at the ocean bottom and finding microplastic in blood are some examples.
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