The element that combines with oxygen to give an amphoteric oxide is

Explain the following:
$(1)$ $BF_3$ does not hydrolyze.
$(2)$ Why does the element silicon not form a graphite-like structure,whereas carbon does?

Explain ionization enthalpy and electronegativity for elements of the Boron family.

The number of acidic protons present in $H_3PO_2$,$H_3PO_3$ and $H_3PO_4$ respectively,are .....

In which of the following reactions is hydrogen one of the products?
$i$. $2NaBH_4 + I_2 \longrightarrow$
$ii$. $2BF_3 + 6NaH \xrightarrow{450 \ K}$
$iii$. $4BF_3 + 3LiAlH_4 \longrightarrow$
$iv$. $3B_2H_6 + 6NH_3 \xrightarrow{\text{heat}} 2B_3N_3H_6 + 12H_2$

Which of the following compounds is electron-deficient?