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

Two students were given the task to prepare an adduct $NH_3 \to BH_3$ at low temperature :-
Student $I$ :- She mixed $B_2H_6$ and $NH_3$
Student $II$ :- He mixed $B_2H_6$ with $THF$ followed by addition of $NH_3$
Which student is expected to get the $CORRECT$ final product?

When orthoboric acid $(H_3BO_3)$ is subjected to strong heating, the residue left is

Explain ionization enthalpy and electronegativity for elements of the Boron family.

Which elements of group $13$,except $B$,can form tetrahedral and octahedral complexes in aqueous medium?

In which of the following does the inert pair effect play a significant role?