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Q42 (IAS/2012) Environment & Ecology › Pollution & Conservation › Ozone layer protection Answer Verified

Consider the following statements : Chlorofluorocarbons, known as ozone-depleting substances, are used 1. in the production of plastic foams 2. in the production of tubeless tyres 3. in cleaning certain electronic components 4. as pressurizing agents in aerosol cans Which of the statements given above is/are correct?

Result
Your answer: —  Â·  Correct: C
Explanation

Chlorofluorocarbons (CFCs) are versatile chemicals historically used across several industrial sectors. They are extensively used as foaming or blowing agents in the production of plastic foams, such as polyurethane and insulation products [5]. In the electronics industry, CFCs served as critical solvents for cleaning delicate electronic and metallic components due to their non-corrosive and stable nature [2]. Furthermore, they were widely employed as pressurizing agents (propellants) in aerosol cans for products like sprays and local anesthetics [7]. However, there is no established industrial use of CFCs in the production of tubeless tyres, which primarily utilize synthetic rubbers and carbon black. Due to their role in stratospheric ozone depletion, the Montreal Protocol has phased out these substances [5]. Therefore, statements 1, 3, and 4 are correct.

Sources

  1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 19: Ozone Depletion > here it is used? > p. 268
  2. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 6: Environmental Degradation and Management > ozone depletion > p. 12
  3. [6] https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/trichlorofluoromethane
  4. [7] https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=00000MVI.TXT
  5. [3] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 7: Climate Change > 2. greenhouse gases > p. 11
  6. [4] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 28: International Organisation and Conventions > 28.20. KIGALI AGREEMENT > p. 409
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SIMILAR QUESTIONS

CAPF · 2013 · Q121 Relevance score: 0.92

Statement I : Ozone is produced naturally by the action of ultraviolet radiation on oxygen molecule (02) in the upper atmosphere. Statement I : Ozone depletion has been caused by the release of chlorofluoro- carbons (CFCs) into the atmosphere.

IAS · 2005 · Q121 Relevance score: 0.02

Consider the following statements: 1. Kyoto Protocol came into force in the year 2005. 2. Kyoto Protocol deals primarily with the depletion of the Ozone layer. 3. Methane as a greenhouse gas is more harmful than carbon dioxide. Which of the statements is/are correct?

CDS-II · 2011 · Q13 Relevance score: 0.00

Which of the following statements regarding ozone layer within the atmos- phere is/are correct ? 1. It absorbs most of the ultraviolet radiation found in the Sun’s rays. 2. Chlorofluorocarbons are serious threat to the ozone layer. Select the correct answer using the code given below :

CDS-I · 2013 · Q45 Relevance score: -0.72

Statement I : Chlorine radicals (Cl) initiate the chain reaction for ozone depletion. Statement I : Gaseous hypo- chlorous acid and chlorine are photolysed by sunlight.

IAS · 2004 · Q56 Relevance score: -1.54

Consider the following statements: 1. Baking soda is used in fire extinguishers. 2. Quicklime is used in the manufacture of glass. 3. Gypsum is used in the manufacture of Plaster of Paris. Which of the statements given above is/are correct ?