Identify the correct statements with respect to orthoboric acid from the following.
I) It is a weak tribasic acid
II) It has a layer structure in which planar ${\mathrm{BO}}_3$ units are joined by hydrogen bonds
III With water it forms ${\left[\mathrm{B}(\mathrm{OH}{)}_4\right]}^{-}$
IV) It is not obtained by the hydrolysis of diborane

Inorganic graphite is $\underline{ }$

Identify the correct statements regarding fullerene.

$\mathrm{i}.$ It has $60$ vertices.
$\mathrm{ii}.$ All the carbon atoms are in the ${\mathrm{sp}}^3$ hybridisation.
$\mathrm{iii}.$The number of rings having six carbons each is $20$ and the number of rings having five carbons each is $12$.
$\mathrm{iv}.$  All the $\mathrm{C}-\mathrm{C}$ bond lengths in it are equal.

What would be the products for the following reactions respectively? (water molecules would be the expected biproduct)

$\left(\mathrm{i}\right) {\mathrm{SiO}}_2+2\mathrm{NaOH}\to ?$

$\left(\mathrm{ii}\right) {\mathrm{SiO}}_2+4\mathrm{HF}\to ?$