What is the classification for this reaction?

SO3+ H2O---> H2SO4

oxidation reduction
combination
double replacement
replacement
decomposition

Answer:
Combination

A combination reaction is a reaction where two reactants form one product.

It can't be an oxidation/reduction reaction because the oxidation numbers don't change. It can't be double replacement because that would involve two products. It isn't single replacement because that would also require two products. It can't be decomposition because there would need to be more products.
combination. do some math
combination

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