Q.

In upper layer of atmosphere ozone is formed by -

A. the action of ultraviolet rays on oxygen
B. the combination of oxygen molecules
C. subjecting oxygen to high pressure
D. the action of nitrogen on oxygen in atmosphere
Answer» A. the action of ultraviolet rays on oxygen
Explanation: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO ) and volatile organic compounds (VOCs), such as xylene, react in the atmosphere in the presence of sunlight containing ultra violet rays. NOx, CO, and VOCs are called ozone precursors. CO + 2O2 + CO2 + O3
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