Question

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. (a), (b) and (c)
• B. (b) and (c)
• C. (a) and (d)
• D. All four

Answer 1

The correct option is B

(b) and (c)

Explanation for the correct answer:-

Option (B):

• Ozone or also called trioxygen $\left({\mathrm{O}}_3\right)$ is an inorganic molecule.
• It has a distinctively pungent smell and is a pale blue gas.
• Ozone $\left({\mathrm{O}}_3\right)$ is a strong oxidant and it is even stronger than chlorine.
• As a result it is used as a disinfect, deodorize, decolourize and decompose organic substances that are present in water.
• Ozone acts as a protective shield around the atmosphere.
• This protects us from the harmful UV rays from the sun by absorbing them.
• Hence it is the correct option.

Explanation for the incorrect answer:-

Option (A):

• For the survival of the organism, oxygen is needed for breathing, not ozone.
• Hence it is the incorrect option.

Option (C):

• For the survival of the organism, oxygen is needed for breathing, not ozone.
• The proportion of ozone in our atmosphere is $0.000004\%$but not $3\%$.
• Hence it is the incorrect option.

Option (D):

• Since statement (a) and statement (d) is not correct, thus all the statement cannot be correct.
• Hence it is the incorrect option.

Therefore, option (B) is the correct answer