Which property of manganese dioxide it turn hydrogen peroxide into water faster than it would without it? manganese dioxide is an acid. manganese dioxide is a catalyst. manganese dioxide is highly reactive. manganese dioxide is used up very fast.

Manganese dioxide is a catalyst.

Explanation:

The decomposition of hydrogen peroxide into water and oxygen is a slow reaction and MnO₂ is used as a catalyst to speed up the reaction.

The role of MnO₂ (catalyst):

Chemical reactions occur faster in the presence of a catalyst because the catalyst provides an alternative reaction pathway with a lower activation energy than the non-catalyzed mechanism. In catalyzed mechanisms, the catalyst usually reacts to form a temporary intermediate, which then regenerates the original catalyst in a cyclic process. A substance which provides a mechanism with a higher activation energy does not decrease the rate because the reaction can still occur by the non-catalyzed route.The catalyst does not used up in the reaction.

So, the right choice is:

Manganese dioxide is a catalyst.

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.