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The redox reaction among the following is:

1. combination of dinitrogen with dioxygen at 200 K
2. reaction of H2SO4 with NaOH
3. formation of ozone from atmospheric oxygen in the presence of sunlight
4. reaction of [Co(H2O)6]Cl3 with AgNO3

Correct answer: combination of dinitrogen with dioxygen at 200 K

Solution

Combination of N2 with O2 to give NO is a redox reaction (N: 0 -> +2, O: 0 -> -2). Ozone formation from O2 keeps oxygen at 0 (no redox), H2SO4 + NaOH is acid-base, and [Co(H2O)6]Cl3 + AgNO3 is precipitation. So the redox reaction is the dinitrogen-dioxygen combination.

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