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

$(BN)_n$  exists in

Boron forms $BX_3$ type of halides. The correct increasing order of Lewis-acid strength of these halides is

Which of the following statements about anhydrous aluminium chloride is correct?

$B{\left( {OH} \right)_3} + NaOH \to NaB{O_2} + Na\left[ {B{{\left( {OH} \right)}_4}} \right] + {H_2}O$ 

How can this reaction is made to proceed in forward direction?

$N{a_2}{B_4}{O_7}.10{H_2}O \xrightarrow{\Delta } X + NaB{O_2} + {H_2}O$

$X + C{r_2}{O_3}\xrightarrow{\Delta }Y$ (Green coloured)

$X$ and $Y$ are