Question

Which of the following oxides are basic?

• A. $B_2{O}_3$
• B. $T{l}_{2}O$
• C. $I{n}_2{O}_3$
• D. $A{l}_2{O}_3$

Answer 1

Answer: (B), (C)

The correct options are
B $T{l}_{2}O$
C $I{n}_2{O}_3$


The nature of these oxides varies down the group.
$B_2{O}_3$ is acidic and reacts with basic (metallic) oxides forming metal borates. It also reacts with water to form boric acid. aluminium and gallium oxides are amphoteric in nature and those of indium and thallium are basic in their properties.