Q.12. 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

Harshit Singh , 3 Years ago

Grade 12th pass