Barrons SAT Subject Test Chemistry, 13th Edition

(Marvins-Underground-K-12) #1

  1. (E) The oxidation state of oxygen in peroxide compounds is −1. The
    oxidation state of the oxygen in water is −2 and in elemental oxygen is 0.
    Therefore, the oxygen is being both reduced and oxidized. This process is
    referred to as disproportionation. In the reaction, the hydrogen is not being
    reduced or oxidized.

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