Borax in its crystal possess
$3$ tetrahedral unit
$2$ tetrahedral and $2$ planar triangular units
$3$ tetrahedral and $2$ planar triangular units
all tetrahedral units
Below are two statements, one labeled as Assertion $(A)$ and the other as Reason $(R):$
Assertion $(A)$: Among group $13$ elements, boron's melting point is unusually high $(2453 \mathrm{~K})$.
Reason $(R):$ Solid boron has a strong crystalline lattice.
In the context of the above statements, choose the correct answer from the following options:
Is boric acid a protic acid ? Explain.
Describe the shapes of $BF $$_{3}$ and $BH _{4}^{-}$. Assign the hybridisation of boron in these species.
The Lewis acid nature of $BX_3$ follows the order
The type of hybridisation of boron in diborane is