Which of the following statements about borate analysis are correct? One or more options may be correct.

ABoric acid is a tribasic Bronsted acid giving $BO X_{3} X^{3 -}$ in water.
BVolatile $B (OC X_{2} H X_{5}) X_{3}$ is formed when borate is heated with ethanol and concentrated $H X_{2} SO X_{4}$ .
CAn aqueous solution of borax is alkaline.
DBoron in $B (OC X_{2} H X_{5}) X_{3}$ is $s p^{2}$ hybridised.

Answer: B, C, D

The ester

B (OC X_{2} H X_{5}) X_{3}

is volatile and trigonal planar (

s p^{2}

B). Borax hydrolyses to

H X_{3} BO X_{3}

and

OH X^{-}

, so its solution is alkaline. Boric acid is not tribasic; it is a weak monobasic Lewis acid,

B (OH) X_{3} + H X_{2} O [B (OH) X_{4}] X^{-} + H X^{+}

. Correct: first, second and fourth.