Which of the following statements is correct?

The number of neutrons present in the more abundant isotope of boron is $x$. Amorphous boron upon heating with air forms a product,in which the oxidation state of boron is $y$. The value of $x+y$ is ...

The Lewis acid nature of $BX_3$ follows the order:

Consider the following flow diagram for the extraction of borax from colemanite:
$2CaO \cdot 3B_2O_3 + Na_2CO_3 \xrightarrow{\text{aq. medium}} Z \text{ (Residue/ppt)} + \text{Filtrate}$
$\text{Filtrate} \xrightarrow{\text{Crystallisation & Filtration}} X \text{ (in filtrate)} + Y \text{ (Residue)}$
$X + CO_2 \to Y$
Identify compounds $X$ and $Y$ respectively.

Explain the structures of diborane and boric acid.

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$a$. Borax	$i$. $NaBO_2$
$b$. Kernite	$ii$. $Na_2B_4O_7 \cdot 4H_2O$
$c$. Orthoboric acid	$iii$. $H_3BO_3$
$d$. Borax bead	$iv$. $Na_2B_4O_7 \cdot 10H_2O$

Choose the correct answer from the options given below: