The chemical name of borax is

Diborane reacts with ammonia to form $X$, which on heating gives $H_2$ and borazine. $X$ is

Consider the compounds,$BCl_3$ and $CCl_4$. How will they behave with water? Justify.

Which of the following is not associated with water molecules?

Substance $X$ reacts with an aqueous solution of $NaOH$ to form $Y$ and releases $H_2$ gas. When an aqueous solution of $Y$ is heated at $323 \; K - 333 \; K$ and $CO_2$ gas is passed through it,it yields $Al_2O_3 \cdot xH_2O$ (often represented as $Al(OH)_3$) and $Z$. Heating $Z$ at $1200^{\circ}C$ produces $Al_2O_3$. Identify $X, Y,$ and $Z$.

Explain the atomic radius of elements of the boron family.