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Sulfer Oxside and Nitrogen oxside

SOx and NOx represent the many different gases obtained by the oxidation of sulfur and nitrogen. Since both sulfur and nitrogen can have a number of valence states, the molecule can continue to be oxidized from: SO, SO2, SO3, and SO4 nitrogen has even more possible oxidation products NO, NO2. N2O (laughing gas) NO3, NO4 , N2O5 et al.

Therefore the use of the variable x is to preclude typing all the possibilities.

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Q: What do So x and NO x mean?
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