Which one of the following is not a redox reaction? 2H2O2(aq) → 2H2O(l) + O2(g) N2(g) + 3H2(g) → 2NH3(g) BaCl2(aq) + K2CrO4(aq) → BaCrO4(aq) + 2KCl(aq) 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) 2H2O(g) → 2H2(g) + O2(g)

i believe it is 40–40–20%

explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.