Boric acid is polymeric due to

Which of the following imparts a green colour to the burner flame?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{B}Cl_3 + 3H_2O \longrightarrow H_3BO_3 + 3HCl$

Select the incorrect statement:
$a$. $PCl_5$ forms a weak monobasic acid during hydrolysis.
$b$. In $B_3N_3H_6$,nucleophilic attack occurs on the $B$ atom.
$c$. $Al_2Cl_6$ is a polar and planar molecule.
$d$. In $AlF_3$,the hybridization of $Al$ is $sp^2$.

Which gases are released when aluminum reacts with concentrated $HCl$ and concentrated $NaOH$,respectively?

Which of the following properties does not support the anomalous behavior of $Boron$?