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6 April, 03:30

When the oxidation number of an element decreases over the course of a reaction, that element has been ... A ionized. B. Oxidized. C. redoxed, D. reduced

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  1. 6 April, 03:43
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    D. Reduced

    Step-by-step explanation:

    Reduction is a decrease in oxidation number.

    You have probably learned OIL RIG, where the RIG means Reduction Is Gain of electrons.

    If an atom has an oxidation number of + 4 and it gains two electrons, its oxidation number decreases to + 2.

    A is wrong, because in the electrolysis of H₂O one product of the reaction is H₂, and the H is not ionic.

    C is wrong, because "redoxed" is not a word.
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