Question

If MnO2 was not added to this reaction, what effect would that have on the production of H2O and O2?

Answer 1

For the answer to the question above, 
I am going to assume that MnO2 is a catalyst most likely breakdown of H2O2 

H2O2----MnO2------> H2O + 1/2 O2 


in that case, B) is answered in the trump suit 

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edit: I need to have a plate account to see - which I don't 
is it something like 


2H2O2 ---------------> 2H2O + O2 
...............MnO2 

where MnO2 is underneath the arrow, in that case, it means it is a catalyst and production will DRASTICALLY decrease in production