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    Chemistry
    Grade-10
    Easy

    Question

    Which of the following half reactions correctly represents a reduction half reaction?

    1. Fe →Fe2+ + 2e-
    2. Pb4+ + 2e- →Pb2+
    3. 2O-2 →O2 + 4e-
    4. Fe + 3e- →Fe3+

    hintHint:

    Lowering of oxidation state is called as reduction.

    The correct answer is: Pb4+ + 2e- →Pb2+

      Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. 
      Pb4+ + 2e- →Pb2+
      Here, oxidation of lead reduces from +4 to +2.

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