$C_{60}$,an allotrope of carbon,contains:

The catenation tendency of $C$,$Si$ and $Ge$ is in the order $Ge < Si < C$. The bond energies (in $kJ \ mol^{-1}$) of $C-C$,$Si-Si$ and $Ge-Ge$ bonds,respectively,are:

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$: $H_2\underline{S}O_5 + H_2O \longrightarrow H_2SO_4 + H_2O_2$

In the following reaction,assign the product of complete hydrolysis at $R.T.$ for the underlined atom:
$\underline{Si}O_2 + H_2O \longrightarrow $ No reaction

Give reasons:
$(i)$ Conc. $HNO_3$ can be transported in aluminium container.
$(ii)$ $A$ mixture of dilute $NaOH$ and aluminium pieces is used to open drain.
$(iii)$ Graphite is used as lubricant.
$(iv)$ Diamond is used as an abrasive.
$(v)$ Aluminium alloys are used to make aircraft body.
$(vi)$ Aluminium utensils should not be kept in water overnight.
$(vii)$ Aluminium wire is used to make transmission cables.

Among the following oxides of $p$-block elements,the number of oxides having amphoteric nature is: $Cl_2O_7, CO, PbO_2, N_2O, NO, Al_2O_3, SiO_2, N_2O_5, SnO_2$