Match List - I with List - II and choose the correct answer from the codes given below: List – I (GHGs) List – II (Atmospheric Lifetime) (Yrs) a. CFC-12 i. 12 b. Methane ii. 50–200 c. CO₂ iii. 114 d. N₂O iv. 100
Codes :
GHG Atmospheric Lifetime Matching Solution
Matching Greenhouse Gases (GHGs) with Atmospheric Lifetimes
The question requires matching gases from List I (GHGs) with their corresponding atmospheric lifetimes in years from List II.
| List - I (GHGs) | List - II (Atmospheric Lifetime - Yrs) |
|---|---|
| a. CFC-12 | i. 12 |
| b. Methane | ii. 50–200 |
| c. CO₂ | iii. 114 |
| d. N₂O | iv. 100 |
Correct Matches and Reasoning
Based on the provided correct answer, the matches are:
- a. CFC-12 matches with iv. 100 years. Chlorofluorocarbons like CFC-12 are known for their very long atmospheric lifetimes, approximately 100 years.
- b. Methane (CH4) matches with i. 12 years. Methane has a relatively shorter atmospheric lifetime compared to other major GHGs, averaging around 12 years.
- c. CO₂ matches with ii. 50–200 years. The atmospheric lifetime of Carbon Dioxide is complex and often represented as a range, typically cited between 50 to 200 years, due to different exchange processes with oceans and land.
- d. N₂O matches with iii. 114 years. Nitrous Oxide has a significant atmospheric lifetime, commonly estimated at around 114 years.
Final Answer Derivation
Combining these matches, the correct code is a-iv, b-i, c-ii, d-iii.
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