Which one of the following oxides dissolves in both hydrochloric acid and sodium hydroxide?

Draw the structure of diborene $(B_2H_4)$.

Which statement is correct for $B_2H_6$?

Boric acid is not used in which of the following?

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$H_4\underline{P}_2O_7 + H_2O \longrightarrow 2H_3PO_4$

Three pairs of compounds are given below. Identify the compound in each pair which has the group $13$ element in a more stable oxidation state. Give reasons for your choice and state the nature of bonding. $(A)$ $TlCl_3, TlCl$ $(B)$ $AlCl_3, AlCl$ $(C)$ $InCl_3, InCl$