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Which of the following compounds is primarily responsible for the depletion of the ozone layer in the stratosphere?
Chlorofluorocarbons (CFCs)
Carbon dioxide
Methane
Nitrogen dioxide
Chlorofluorocarbons (CFCs)
Chlorofluorocarbons (CFCs) are synthetic organic compounds containing carbon, chlorine, and fluorine. When released into the atmosphere, they drift into the stratosphere where ultraviolet radiation breaks them down, releasing reactive chlorine atoms that catalytically destroy ozone molecules.
Chlorofluorocarbons (CFCs) are synthetic organic compounds containing carbon, chlorine, and fluorine. When released into the atmosphere, they drift into the stratosphere where ultraviolet radiation breaks them down, releasing reactive chlorine atoms that catalytically destroy ozone molecules.
The Montreal Protocol on Substances that Deplete the Ozone Layer, agreed upon in 1987, is a landmark international treaty designed to phase out the production and consumption of ozone-depleting substances like CFCs.
CFCs were widely used as refrigerants, propellants in aerosol cans, and solvents.
A single chlorine atom can destroy over 100,000 ozone molecules before being removed from the stratosphere.
The ozone layer absorbs the majority of the Sun's harmful ultraviolet (UV-B) radiation.
Option B (Carbon dioxide) is a primary greenhouse gas responsible for global warming, not direct stratospheric ozone depletion.
Option C (Methane) is a potent greenhouse gas contributing to climate change and tropospheric chemistry.
Option D (Nitrogen dioxide) plays a role in stratospheric chemistry and urban smog, but CFCs are the primary anthropogenic drivers of large-scale stratospheric ozone depletion.
A is correct тАФ Chlorofluorocarbons (CFCs) release chlorine atoms upon UV photodissociation, which catalytically break down stratospheric ozone.
In Indian competitive exams like RRB and SSC, questions on environmental conventions frequently pair ozone depletion (Montreal Protocol) with climate change agreements (Kyoto Protocol and Paris Agreement).
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