Problem: Indicate the oxidation number of oxygen for each compound in the following reaction:2 H2O2(aq) → 2 H2O(l) + O2(g)Select the choice that gives the oxidation numbers of oxygen in each of H2O2, H2O(l), and O2(g), respectively.A.  −1,  −2, 0B. −1, 0, −2C. 0, −2, −1D. −2, −1, 0Hydrogen has three possible oxidation numbers:• − 1 when bonded to a metal,• 0 when in elemental form, H2, and• +1 when bonded to a nonmetal.Oxygen has several possible oxidation numbers:• −2 when bonded to a nonmetal (other than fluorine) or as the oxide ion, O2−,• −1 as the peroxide ion, O22−,• −1/2 as the superoxide ion, O2−, and• 0 when in elemental form, O2 or O3.

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Indicate the oxidation number of oxygen for each compound in the following reaction:

2 H2O2(aq) → 2 H2O(l) + O2(g)

Select the choice that gives the oxidation numbers of oxygen in each of H2O2, H2O(l), and O2(g), respectively.

A.  −1,  −2, 0

B. −1, 0, −2

C. 0, −2, −1

D. −2, −1, 0


Hydrogen has three possible oxidation numbers:

• − 1 when bonded to a metal,
• 0 when in elemental form, H2, and
• +1 when bonded to a nonmetal.

Oxygen has several possible oxidation numbers:

• −2 when bonded to a nonmetal (other than fluorine) or as the oxide ion, O2−,
• −1 as the peroxide ion, O22−,
• −1/2 as the superoxide ion, O2, and
• 0 when in elemental form, O2 or O3.

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