$A$ metal $A$,which is used in the thermite process,when heated with oxygen gives an oxide $B$,which is amphoteric in nature. Identify $A$ and $B$. Write down the reactions of oxide $B$ with $HCl$ and $NaOH$.

(A) The metal $A$ used in the thermite process is Aluminum $(Al)$.
When Aluminum is heated with oxygen,it forms Aluminum oxide $(Al_{2}O_{3})$,which is oxide $B$.
Aluminum oxide is amphoteric,meaning it reacts with both acids and bases.
$A = Al$
$B = Al_{2}O_{3}$
Reaction with $HCl$ (acid):
$Al_{2}O_{3} + 6HCl \rightarrow 2AlCl_{3} + 3H_{2}O$
Reaction with $NaOH$ (base):
$Al_{2}O_{3} + 2NaOH \rightarrow 2NaAlO_{2} + H_{2}O$