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Match List - I with List - II. Choose the correct answer.
Column I
- A. Biochemical oxygen demand
- B. Photochemical smog
- C. Classical smog
- D. Ozone layer depletion
Column II
- I. oxidising mixture
- II. polar stratospheric cloud
- III. organic matter in water
- IV. reducing mixture
Correct answer: A → III, B → I, C → IV, D → II
Detailed Solution
Biochemical oxygen demand - organic matter in water; Photochemical smog - oxidising mixture; Classical smog - reducing mixture; Ozone layer depletion - polar stratospheric clouds.