(a) It is essential for breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion in air is about 3%.
Which of these statements are correct?
(i) (a), (b) and (c)
(ii) (b) and (c)
(iii) (a) and (d)
(iv) All four
Correct Answer : (ii) (b) and (c)
Solution: Ozone is used to disinfect water during wastewater treatment. Ozone is an unstable gas that destroys bacteria and virus.
It also absorbs ultraviolet rays coming from the sun.
