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

Which of the following statements is correct?

$AlCl_3$ on hydrolysis gives:

Consider the following reactions:
$(a) \ B_2H_6 + 6H_2O \to 2H_3BO_3 + 6H_2$
$(b) \ B_2H_6 + 6CH_3OH \to 2B(OCH_3)_3 + 6H_2$
$(c) \ B_2H_6 + 3Cl_2 \to 2BCl_3 + 6HCl$
$(d) \ B_2H_6 + 6CH_3COOH \to 2B(OCOCH_3)_3 + 6H_2$
Identify the incorrect statement about the product$(s)$.

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$
$H_4\underline{B}_2O_5 + H_2O \longrightarrow H_3BO_3$

Which one of the following elements is unable to form $MF_{6}^{3-}$ ion?