Which one of the following is a correct set?

Explain the following:
$(1)$ $Tl(NO_3)_3$ acts as an oxidizing agent.
$(2)$ Carbon shows catenation property but lead does not.

$A$ crystalline solid $X$ reacts with dil. $HCl$ to liberate a gas $Y$. $Y$ decolourises acidified $KMnO_4$. When a gas $Z$ is slowly passed into an aqueous solution of $Y$,colloidal sulphur is obtained. $X$ and $Z$ could be,respectively

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{S}_8 + H_2O \longrightarrow$ No reaction

The structure of silicates in which three oxygen atoms of $[SiO_4]^{4-}$ are shared is known as:

The basic structural unit of feldspar,zeolites,mica and asbestos is