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?
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A hard Science & Technology multiple-choice question from UPSC Prelims 2022. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: D. 2 and 3
Statement 1 is wrong — nanoparticles occur naturally (e.g., in volcanic ash and sea spray). Statement 2 is correct — metallic-oxide nanoparticles (titanium dioxide, zinc oxide) are used in cosmetics and sunscreens. Statement 3 is correct — some commercial nanoparticles entering the environment can be unsafe for humans. So 2 and 3 — option (d).
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