Boron forms covalent compounds due to:

Which element belongs to the family of elements that also includes the element gallium?

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$H_4\underline{P}_2O_7 + H_2O \longrightarrow 2H_3PO_4$

Boron halides behave as Lewis acids because of their nature.

What is the correct order of Lewis acidic strength for boron trihalides?

Identify the correct statements from the following:
$(a)$ In orthoboric acid, boron is in planar geometry.
$(b)$ In $BCl_3 \cdot NH_3$, boron has tetrahedral geometry.
$(c)$ Aqueous solution of borax is acidic.