Which of the following statements about boron carbide is wrong?

Which of the following hydroxides is acidic?

In the following unbalanced reaction,the product formed is $Al_2O_3 + NaOH_{(aq)} + H_2O \longrightarrow$

Select the correct statements from the following:
$A$) Aluminium liberates $H_2$ gas with dil. $HCl$ but not with aqueous $NaOH$.
$B$) Formula of sodium metaborate is $Na_3BO_3$.
$C$) Boric acid is a weak monobasic acid.
$D$) For thallium,$+1$ state is more stable than $+3$ state.

What is the difference between the first member of a group and the other elements in the $s$- and $p$-block? Why?

Describe the chemical properties of the elements of group $13$.