What is the product for the reaction of aluminum oxide and sulfuric acid?

Question

Which of the following compounds results from treating aluminum oxide with excess aqueous sulfuric acid and what are the steps to getting it?
(b) [Al(H2O)6]2(SO4)3
(c) H[Al(OH)4]
(d) Al2S3
(e) Al(OH)3

Answer 1

Al2O3 + 3H2SO4 -------- Al2(SO4)3 + 3 H2O
The compound forms a hexahydrate in aqueous systems ( aqueous H2SO4 ).

b is the answer this is a typical neutralization of a basic oxide withan acid forming a salt plus water.

Answer 2

(b)[Al(H2O)6]2(SO4)3
Al2O3 + 6H+aq + 12H2O ===> 2[Al(H2O)6]3+ aq + 3H2O