Question

Which one of the following forms a basic oxide?

• A. $B$
• B. $Tl$
• C. $Al$
• D. $Ga$

Answer 1

The correct option is B $Tl$

In the group as we move from Boron to Thallium, metallic character increases thereby increasing the basicity of oxides.

Thus, oxide of $Tl$ is basic.