Question

Study the following statements about ozone:

1. It is essential for breathing of living organisms.
2. It is used to disinfect water.
3. It absorbs ultraviolet rays.
4. Its proportion in air is about 3%.

Which of these statements are correct?

Options

• (a), (b) and (c)

• (b) and (c)

• (a) and (d)

• All four

Answer 1

(b) and (c)

Explanation:

• Statement (a) is incorrect because oxygen, not ozone, is essential for breathing.
• Statement (b) is correct as ozone is used to disinfect water.
• Statement (c) is correct because ozone absorbs ultraviolet rays.
• Statement (d) is incorrect because the proportion of ozone in the air is much less than 3%.