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Which of the following reactions involves neither oxidation nor reduction? A) N2 + 3H2 ? 2NH3 B) NH4NO2 ? N2 + 2H2O C) Cu +

Which of the following reactions involves neither oxidation nor reduction?
A) N2 + 3H2 ? 2NH3
B) NH4NO2 ? N2 + 2H2O
C) Cu + 2Ag+ ? Cu2+ + 2Ag
D) 2CrO42- + 2H+ ? Cr2O72- + H2O
E) C2H4 + H2 ? C2H6

I was thinking B) but I'm confused on how to prove it.

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