Match List-I with List-II and select the correct answer using the code given below the Lists : List-I A. Ozone gas B. Nitrous oxide C. Carbon dioxide D. Carbon monoxide List-II 1. Combines with haemoglobin 2. Ultraviolet radiation 3. Component of air in small quantity 4. Visible radiation 5. Infrared radiation Code : A B C D

The matching of atmospheric gases to their properties is as follows: Ozone (A) acts as a protective layer in the stratosphere by absorbing ultraviolet radiation [c5][t4]. Nitrous oxide (B) is a potent greenhouse gas that absorbs infrared radiation [t1][t7]. Carbon dioxide (C) is a major component of air found in small quantities (approximately 0.04%) and is meteorologically significant for its role in the greenhouse effect [c5]. Carbon monoxide (D) is a toxic gas that readily combines with haemoglobin in the blood to form carboxyhaemoglobin, which prevents oxygen transport [t2][t3][t9]. While both nitrous oxide and carbon dioxide absorb infrared radiation, in standard matching contexts for competitive exams, carbon dioxide is often identified by its atmospheric quantity or general greenhouse role, while nitrous oxide is specifically highlighted for its infrared absorption characteristics or vice versa depending on the options provided. Option 4 (A-2, B-5, C-3, D-1) provides the most accurate scientific alignment.

Sources

1. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 7: Composition and Structure of Atmosphere > Gases > p. 64
2. [2] https://pmc.ncbi.nlm.nih.gov/articles/PMC7044178/
3. [3] https://www.baaqmd.gov/~/media/files/planning-and-research/ceqa/final_draft_baaqmd_ceqa_guidelines_november_12_2009.pdf
4. [4] https://www.sciencedirect.com/topics/earth-and-planetary-sciences/carbon-monoxide
5. [5] https://www.ncbi.nlm.nih.gov/books/NBK138710/