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In a basic solution Frost diagram for sulfur, the species that will disproportionate are sulfite (SO3^2-) and sulfide (S^2-).
Here's why:
Sulfite (SO3^2-) can be oxidized to sulfate (SO4^2-) and reduced to sulfur (S) or sulfide (S^2-).
Sulfide (S^2-) can be oxidized to sulfur (S) or even further to sulfite (SO3^2-).