Chemical treatment — task. Science CBSE Homework Assignments, Class 7.

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?

(a), (b) and (c)
(b) and (c)
(a) and (d)
All four

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2. Chemical treatment

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