In which reaction does Hydrogen behave as an oxidizing agent?
0 0 +1 -1
1)H2 + Cl2 --> 2HCl
+2 -1 0 +3 -1
2)C2H4 + H2 --> C2H6
0 0 +3 -1
3)N2 + 3H2 --> 2NH3
0 0 +1 -1
4)2Na + H2 --> 2NaH
In the second equation, oxidation number of H in H2 (0) decreases to -1 in C2H6, while oxidation number of C in C2H4 (+2) increases to +3 in C2H6. Isn't H an oxidising agent in this case? The answer given is the last equation, which is also correct. I'm lost. Isn't equation 2 valid too?