posted by Anonymous .
Which one of the following is not a redox reaction?
PbO2(s) + Pb(s) + 2H2SO4(aq) 2PbSO4(s) + 2H2O(l)
Ba(NO3)2(aq) + Na2CrO4(aq) BaCrO4(s) + 2NaNO3(aq)
Zn(s) + 2MnO2(s) ZnO(s) + Mn2O3(s)
2H2O(g) 2H2(g) + O2(g)
lol I think you forgot to put the arrow symbol somewhere in those reactions. But it can still be answered.
The answer is
Ba(NO3)2(aq) + Na2CrO4(aq) -> BaCrO4(s) + 2NaNO3(aq)
This is just a double displacement reaction. And looking at the charge of each element involved (in reactant and product side), the charges of the individual elements did not change, thus making it not a redox reaction.
Hope this helps :3
Thank you so much!