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13 August, 08:11

Which of the following occurs during a redox reaction?

A. Only electrons are obtained

B. Only electrons are lost

C. Electrons are won and lost

D. Electrons are not earned or lost

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Answers (1)
  1. 13 August, 10:08
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    C = Electrons are won and lost.

    Explanation:

    The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining and losing the electrons and oxidation state of elements are changed.

    Oxidation:

    Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

    Reduction:

    Reduction involve the gain of electron and oxidation number is decreased.

    Consider the following reactions.

    4KI + 2CuCl₂ → 2CuI + I₂ + 4KCl

    the oxidation state of copper is changed from + 2 to + 1 so copper get reduced.

    CO + H₂O → CO₂ + H₂

    the oxidation state of carbon is + 2 on reactant side and on product side it becomes + 4 so carbon get oxidized.

    Na₂CO₃ + H₃PO₄ → Na₂HPO₄ + CO₂ + H₂O

    The oxidation state of carbon on reactant side is + 4. while on product side is also + 4 so it neither oxidized nor reduced.

    H₂S + 2NaOH → Na₂S + 2H₂O

    The oxidation sate of sulfur is - 2 on reactant side and in product side it is also - 2 so it neither oxidized nor reduced.

    Oxidizing agents:

    Oxidizing agents oxidize the other elements and itself gets reduced.

    Reducing agents:

    Reducing agents reduced the other element are it self gets oxidized.
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