Lead is soluble in:

In which one of the following pairs,both oxides are acidic?

Identify the correct statements from the following.
$(i)$ Quartz is a piezoelectric material.
$(ii)$ All group $14$ tetrachlorides except $CCl_4$ are easily hydrolyzed in water.
$(iii)$ The $C-C$ bond distance within the layer of graphite is $154 \ pm$.
$(iv)$ $SiO_2$ is soluble in aqueous $HCl$ solution.

Which of the following is an incorrect statement?

The element similar to carbon is

The basic building unit of all silicates is