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Provide the solutions for the following chemistry questions concerning oxidation numbers.

Chemistry

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Here are the solutions to the chemistry questions:

SECTION A

1. What is the oxidation number of oxygen in O₂?

  1. Identify the substance.

    O₂ is an elemental molecule.

  2. Recall the rule for oxidation numbers of elements in their elemental form.

    The oxidation number of an element in its elemental form is 0.
    The correct option is (a).

    a) 0\boxed{\text{a) 0}}

    2. What is the oxidation number of nitrogen in NH₃?

  3. Assign known oxidation numbers.

    Hydrogen typically has an oxidation number of +1 in compounds with non-metals.

  4. Set up an equation for the sum

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