Question

Element X which forms $XC{l}_3$ and $X_2{O}_3$ would most likely belong to the group :

• A. alkali metals
• B. alkaline earth metals
• C. group $13$
• D. halogens
• E. noble gases

Answer 1

Answer: (C)

group $13$

Element $X$, which forms $XC{l}_3$ and $X_2{O}_3$, would have oxidation state $+3$, which is the characteristic feature of group $13$ (Valance electrons =3). Therefore, the element would most likely belong to the group 13. Examples of such elements include B, Al, Ga etc.