Question

which of the following processes oxidizes nitrogen?
electrical storm
hail
rain
photosynthesis

Explanation:

• Electrical storm: During an electrical storm (thunderstorm), lightning provides energy to oxidize atmospheric nitrogen ($\ce{N2}$) into nitrogen oxides (e.g., $\ce{NO}$, $\ce{NO2}$). This is part of atmospheric nitrogen fixation/oxidation.
• Hail: Hail is frozen precipitation; it does not involve nitrogen oxidation.
• Rain: Rain is liquid precipitation and doesn’t oxidize nitrogen.
• Photosynthesis: Photosynthesis is about converting $\ce{CO2}$ to glucose using light, involving carbon, not nitrogen oxidation.

Answer:

A. Electrical storm