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

Chemistry
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N2 + 3H2 2NH3
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Other answers:

N2 has zero oxidation state and H2 have zero oxidation state, since both occur as natural elements.. Or you may say both elements have atoms of the same electronegativity. when ammonia is formed, N is more electronegative than H so it reduces in oxidation state to -3 and since H is less electronegative, each H gains a +1 oxidation state.
gain in oxidation state is oxidation, reduce in oxidation state is reduction
that makes sense, thanks so much !
NlGGA
NlGGA

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