Aluminium oxide reacts with potassium hydroxide to form white salt and water. What is the nature of aluminium oxide?

Q. Assertion : Aluminum oxide react with acids as well as bases to produce salt and water
Reason : Aluminum oxide is amphoteric in nature.

Q.

The salt formed when aluminium oxide reacts with potassium hydroxide is:

Q. An element of group 2 forms a covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.

Q. Amphoteric nature of aluminium is employed in which of the following process for extraction of aluminium?

Q. Consider the following statements and arrange in the order of true/false as given in the codes:
$S_1$: Oxides of boron $\left(B_2{O}_3\right)$ and silicon $\left(Si{O}_2\right)$ are acidic in nature.
$S_2$: Oxides of aluminium $\left(A{l}_2{O}_3\right)$ and gallium $\left(G{a}_2{O}_3\right)$ are amphoteric in nature.
$S_3$: Oxides of indium $\left(l{n}_2{O}_3\right)$ and thallium $\left(T{l}_2{O}_3\right)$ are basic in nature.
$S_4$: Oxides of germanium $\left(Ge{O}_2\right)$ and tin $\left(Sn{O}_2\right)$ are acidic in nature.