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Ozone: statements and assertions

This type of question, asked 4 times: 2023, 2024, 2025, 2026. All 12 questions below, oldest first.

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  1. Question 1

    2023

    26
    “Ozone, although a deadly poison, performs an essential function for the earth and its inhabitants.” Explain.

  2. Question 2

    2023

    21
    (i) State the essential function performed by ozone at the higher levels of the atmosphere. (ii) Why was there a sharp drop in the amount of ozone in the atmosphere in 1980’s.

  3. Question 3

    2023

    25
    Why is damage to the ozone layer a cause for concern ? What steps are being taken to limit this damage ?

  4. Question 4

    2024

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : Ozone layer protects the surface of the Earth from harmful UV radiations. Reason (R) : Chlorofluorocarbons (CFCs) are responsible for depletion of ozone layer.

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  5. Question 5

    2024

    16
    Consider the following statements about ozone : (a) Ozone is poisonous gas. (b) Ozone shields the earth’s surface from the infrared radiation from the sun. (c) Ozone is a product of UV radiations acting on oxygen molecule. (d) At the lower level of the earth’s atmosphere, ozone performs most essential function. The correct statements are

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  6. Question 6

    2024

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : Oxygen is essential for all aerobic forms of life. Reason (R) : Free oxygen atoms combine with molecular oxygen to form ozone.

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  7. Question 7

    2025

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    20
    Assertion (A) : The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R) : The oxygen atoms combine with molecular oxygen to form ozone.

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  8. Question 8

    2025

    16
    The incorrect statement about ozone is

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  9. Question 9

    2026

    5
    Select the incorrect statement from the following :

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  10. Question 10

    2026

    12
    (a) Explain the role of UV radiation in the formation of ozone layer. (b) Why is UV radiation considered as highly damaging to organisms ?

  11. Question 11

    2026

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    9
    Assertion (A) : Ozone at higher levels of atmosphere is a product of UV radiation acting on oxygen molecule. Reason (R) : The higher energy of UV splits apart some molecular O2\mathrm{O_2}.

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  12. Question 12

    2026

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    9
    Assertion (A) : Ozone (O3)(\mathrm{O_3}) gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen (O2)(\mathrm{O_2}). Reason (R) : The amount of ozone in the atmosphere began to drop sharply in 1980s.

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