$RCl$ $\xrightarrow[Si]{Cu \text{ powder}} R_2SiCl_2$ $\xrightarrow{H_2O} R_2Si(OH)_2$ $\xrightarrow{\text{condensation}} A$
Compound $(A)$ is:

The correct order of bond enthalpy $\left( kJ \, mol^{-1} \right)$ is :

State True or False for the following statements:
$(1)$ Oxides of indium and thallium are basic in their properties.
$(2)$ $C$,$Si$ are non-metals,while germanium,tin,and lead are high melting metals.

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.

Which gas is used in aerated water?

Identify the correct statements:
$(I)$ Germanium exists only in traces.
$(II)$ The order of electronegativity of $Si, Ge, Sn$ is $Sn > Ge > Si$.
$(III)$ All group $14$ elements are available in solid state.