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📖 Don't skip the in-text questions!
⚠️ Key topics to highlight: Photochemical smog, BOD vs COD, Ozone depletion (CFCs), and Green Chemistry.
📢 Attention Students!
⚠️ Key topics to highlight: Photochemical smog, BOD vs COD, Ozone depletion (CFCs), and Green Chemistry. environmental chemistry ncert pdf