Question

please give me answer of following questions (12)Study the 12 following statement about ozone:
(a) It is essential for breathing of living organisms .
(b) It is used to disinfect water .
(c) It absorbs ultraviolet rays.
(d) It's proportion in air is about3%


13 ) which of these statements are correct ?
(a) (a),(b) and (c)
(b) (b) and (c)
(c) (a) and (d)
(d) All four

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Answer 1

Answer:

Ozone, or trioxygen, is an inorganic molecule with the chemical formula O

3

. It is a pale blue gas with a distinctively pungent smell.

Oxygen is essential for the breathing of living organisms. Hence statement (a) is incorrect.

Ozone is a powerful oxidant, stronger than chlorine. Ozone is used to disinfect, deodorize, decolourize and decompose organic substances in water. Hence Statement (b) is correct.

The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. Hence statement (c) is correct.

The proportion of ozone in the air is 0.000004%. Hence Statement (d) Is incorrect.

So, the correct answer is '(b) and (c)'.