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RAS question

Which gas is primarily responsible for the depletion of the ozone layer?

Correct answer: (C) Chlorofluorocarbons (CFCs).

Chlorofluorocarbons (CFCs) are the gases primarily responsible for depletion of the ozone layer.

  1. (A)

    Methane

  2. (B)

    Nitrogen oxide

  3. (C)

    Chlorofluorocarbons (CFCs)

  4. (D)

    Carbon dioxide

Explanation

Chlorofluorocarbons (CFCs) are the gases primarily responsible for ozone-layer depletion because NCERT Class X Science Exemplar Problems identifies depletion of ozone as being mainly due to chlorofluorocarbon compounds. CFCs are the primary cause of ozone depletion, and the Montreal Protocol, signed in 1987, was meant to phase out their production and use. The key distinction is the word "primarily". Other gases may appear in environment chapters, but the standard exam linkage for ozone-layer depletion is CFCs and the Montreal Protocol.

Why the other options are wrong

  • (A) Methane is not the primary ozone-depleting gas; NCERT Class X Science Exemplar Problems identifies chlorofluorocarbon compounds as the main cause.
  • (B) Nitrogen oxide is not the gas primarily responsible for ozone-layer depletion; CFCs are primarily responsible.
  • (D) Carbon dioxide is a familiar environment option, but it is not the main cause of ozone depletion; chlorofluorocarbon compounds are.

Concept

Ozone-layer depletion is an Environment and Ecology concept linked with the Montreal Protocol. RAS often tests static environmental science through pollutant-cause and treaty-purpose pairs.

Source

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