Which reaction is a combination redox reaction involving a non-metal?

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N₂ + 3H₂ → 2NH₃ Correct 2Mg + CO₂ → 2MgO + C NaCl + KNO₃ → NaNO₃ + KCl CaO + H₂O → Ca(OH)2

In N₂ + 3H₂ → 2NH₃, N (0 to -3) is reduced, and H (0 to +1) is oxidized, forming one compound.

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