Study the following statements about ozone:(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

Study the following statements about ozone:(a) It is essential for bre

1.	Study the following statements about ozone:(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
Answer» (ii) (b) and (c)