The formula of $3$ membered discrete chain silicate is

Assertion $(A): [SiF_6]^{2-}$ is formed but $[SiCl_6]^{2-}$ is not.
Reason $(R):$ Electronegativity $(EN)$ of $F$ is higher than $EN$ of $Cl$.

Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding :-

It is observed that $Pb^{2+}$ is more stable than $Pb^{4+}$,while $Sn^{2+}$ is less stable than $Sn^{4+}$. Consider the following reactions:
$PbO_{2} + Pb \rightarrow 2PbO; \Delta_{r}G^{\circ} (1)$
$SnO_{2} + Sn \rightarrow 2SnO; \Delta_{r}G^{\circ} (2)$
Identify the correct set from the following.

The plague of tin is the:

$A$ large amount of energy is released during the formation of $Al_{2}O_{3}$,which is used in which of the following?