Which of the following oxides is amphoteric in nature?

Which one of the following is correct relating to diborane $(B_2H_6)$?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$
$H_4\underline{B}_2O_5 + H_2O \longrightarrow H_3BO_3$

In the following reaction,assign the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{B}_2O_3 + 3H_2O \longrightarrow 2H_3BO_3$

Hydrated $AlCl_3$ is used as :

$2BF_3 + 6NaH \xrightarrow{450 \ K} X_{(g)} + 6NaF$. Which of the following statements is \textbf{Incorrect} for $X$?