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Question

Vocaloid · Answer

two things:

1. combustion ---> so oxygen will be one of the reactants
2. of an inorganic substance ---> so the other reactant will be something *without* carbon

based on those two facts, try to see which reaction qualifies

Vocaloid · Answer

reaction 3 doesn't have oxygen as a reactant, so it's not combustion, eliminate reaction 3

between reactions 1, 2, and 4 - looking at the non-oxygen reactants, which one lacks carbon?

kekeman · Answer

I think it is 2

Vocaloid · Answer

good

kekeman · Answer

I say this because 1 is a combustion reaction but an organic substance

kekeman · Answer

No wait 3 is not a combustion reaction

kekeman · Answer

4 is a combustion reaction but an organic substance