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Chemistry
OpenStudy (anonymous):

Which of the following chemical reactions is an oxidation-reduction reaction?  (3 points) CuSO4 + BaCl2  BaSO4 + CuCl2 Pb(NO3)2 + 2NaCl  PbCl2 + 2NaNO3 N2 + 3H2  2NH3 K2SO4 + BaCl2  BaSO4 + 2KCl

OpenStudy (anonymous):

in this kind of problems all you need to do is to write oxidation states of all atoms in equations and you will see in which reaction there is a change in oxidation state and thus you will know which one is red-ox reaction. in your case answer is: N2 + 3H2 --> 2NH3 because N2 and H2 change from oxidation state 0 to +1 hydrogen, and -3 nitrogen.

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