What is a reducing agent?

  • A
    $A$ substance that gains electrons.
  • B
    $A$ substance that loses electrons during a chemical reaction.
  • C
    $A$ substance that increases the oxidation state of another substance.
  • D
    $A$ substance that remains unchanged during a reaction.

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Which is an oxidizing agent in the following reaction?
$Fe_{(s)} + Cu_{(aq)}^{2+} \rightarrow Fe_{(aq)}^{2+} + Cu_{(s)}$

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Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process,the oxidation state of chromium changes from

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