Explain relationship between CFC's and Ozone in the stratosphere.
UV rays act on CFC's release CI atoms which act on ozone to release O2 resulting in ozone layer depletion and causing ozone hole.
CBSE Class 12 board exams 2025 to have 50% competency-based questions; no change in 10th
CBSE Class 12 board exams 2024 over; expected result date, trends of last 10 years
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