chemistry

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Which of the following equations does not represent an oxidation-reduction reaction?

3Al + 6HCl → 3H2 + AlCl3


2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3

2H2O → 2H2 + O2

2NaI + Br2 → 2NaBr + I2

Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

  • chemistry -

    You need to learn how to determine this. Here is a set of rules that will allow you to determine the oxidation state of each element in each equation. Then you can answer the question.
    http://www.chemteam.info/Redox/Redox-Rules.html

  • chemistry -

    its the forth one

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