)Hoàn thành sơ đồ phản ứng, ghi rõ điều kiện nếu có

S → SO2 → SO3 → H2SO4 → BaSO4

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.