The composition of borax is:

The correct statements among $I$ to $III$ regarding group $13$ element oxides are,
$I$. Boron trioxide is acidic
$II$. Oxides of aluminium and gallium are amphoteric
$III$. Oxides of indium and thallium are basic

When $BCl_3$ reacts with water,which of the following substances is formed?

Which of the following processes is used to prepare borazine?

Aluminium reacts with $NaOH$ and forms compound '$X$'. If the coordination number of aluminium in '$X$' is $6$, the correct formula of $X$ is:

Which of the following elements is used in thermometry at high temperatures?