Balance the following skeletal equation, and identify the reducing and oxidizing reagent.  O2 (g) + NO (g) `->`  NO3- (aq) Hint: The pH of the resulting solution is lower than the pH of the initial solution. 

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You had an error in your question by listing the NO3- ion as a gas.  As an ion, it exists in aqueous solution.  We know from the pH information above that protons must be produced in the products since that would lower the pH.  We can solve this via the half reaction method.  Take each reagent and product pairing and balance them separately.  Then add the two equations together to get the final balanced reaction.

Start with O2.  The only product we can write for it is H2O since we are told that the product is aqueous.

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