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Which of the following is a redox reaction?

1. Reaction of \( H_{2} S O_{4} \) with \( N a O H \)
2. In atmosphere, formation of \( O_{3} \) from \( O_{2} \) by lightening
3. Formation of oxides of nitrogen from nitrogen and oxygen by lightening
4. Evaporation of \( H_{2} O \)

Correct answer: Formation of oxides of nitrogen from nitrogen and oxygen by lightening

Solution

In the formation of oxides of nitrogen, nitrogen and oxygen start in elemental form and end up in compounds where their oxidation states change, so electron transfer occurs. That makes it a redox reaction.

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