Question 9 • Foothill-B Period-Chemistry-26/27B
In disproportionation, the same element is both oxidized and reduced. It starts in an intermediate oxidation state, then forms products where its oxidation state is higher in one product and lower in another. So the element has at least three oxidation states across the reaction: the starting state and two different product states. The correct choice is “has at least three oxidation states.”
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