Which of the following exhibits moderate electrical conductivity?

$NaOCl$ is used as a bleaching agent and sterilising agent. It can be synthesized by the action of:

The number of amphoteric oxides from the following is
$CO_2, GeO_2, SnO_2, PbO_2, CO, GeO, SnO, PbO$

Which of the following oxidation states are the most characteristic for lead and tin respectively?

Identify the correct statements from the following.
$i$. Melting points and boiling points of group $13$ elements are much higher than those of corresponding group $14$ elements.
$ii$. $SiO$ only exists at high temperatures.
$iii$. $PbI_4$ does not exist.
$iv$. Buckminster fullerene contains twelve $6$-membered carbon rings and twenty $5$-membered carbon rings.

What are the ions called that possess properties similar to halide ions and consist of two or more electronegative atoms,at least one of which is nitrogen?