Dilute aqueous solution of $.......$ acid is used as an antibiotic.

Borax is converted into crystalline boron by the following steps :
$Borax$ $\xrightarrow{HCl} (X)$ $\xrightarrow{\Delta} B_2O_3$ $\xrightarrow{\Delta, Y} B$
Identify $X$ and $Y$ respectively.

Select the correct statements for diborane $(B_2H_6)$:
$1.$ Boron is approximately $sp^3$ hybridized.
$2.$ The $H-B-H$ bridge angle is $180^o$.
$3.$ There are two terminal $B-H$ bonds for each boron atom.
$4.$ There are only $12$ bonding electrons available.

Match the following compounds in List-$I$ with their properties/names in List-$II$.

List-$I$ (Compound)	List-$II$ (Property/Name/Structure)
$A$. $H_3BO_3$	$1$. Dimeric form
$B$. $AlCl_3$	$2$. Back bonding
$C$. $B_3N_3H_6$	$3$. Hydrogen bonding
$D$. $BF_3$	$4$. Inorganic benzene

Which of the following statements is not true about borax?

Which of the following statements is true about $H_3BO_3$?