Ncert solutions

Ncert solutions

Grade 7

Wastewater Story | Exercise

Question 12

Q12) Study the following statements about ozone:

(a) It is essential for the breathing of living organisms.

(b) It is used to disinfect water.

(c) It absorbs ultraviolet rays.

(d) Its proportion of 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

Solution:

(ii) (b) and (c) are correct

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subject-cta

Question 12

Q12) Study the following statements about ozone:

(a) It is essential for the breathing of living organisms.

(b) It is used to disinfect water.

(c) It absorbs ultraviolet rays.

(d) Its proportion of 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

Solution:

(ii) (b) and (c) are correct

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your science exam ?

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Book a free class now
subject-cta
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