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
(ii); (b) and (c); It is used to disinfect water and it absorbs ultraviolet rays; this statement is correct.
Ozone is a powerful oxidising agent which, when dissolved in water, produces a broad spectrum biocide that destroys all bacteria, viruses etc. Ozone water treatment is being used commercially for the treatment of potable water. It absorbs ultraviolet rays or radiations, present in the stratosphere, ozone is created primarily by ultraviolet radiation. Ozone is extremely valuable since it absorbs a range of ultraviolet energy which is very harmful for the earth and our body; and by absorbing these radiations it protects from the damage that could happen to our earth.
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
(ii); (b) and (c); It is used to disinfect water and it absorbs ultraviolet rays; this statement is correct.
Ozone is a powerful oxidising agent which, when dissolved in water, produces a broad spectrum biocide that d...
Step-by-step explanation:
• (ii); (b) and (c); It is used to disinfect water and it absorbs ultraviolet rays; this statement is correct
•
•
• Ozone is a powerful oxidising agent which, when dissolved in water, produces a broad spectrum biocide that destroys all bacteria, viruses etc
• Ozone water treatment is being used commercially for the treatment of potable water
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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