Thermodynamically,the most stable form of carbon is

$Kieselghur$ is an amorphous form of silica which is used in filtration plants. Which of the following is true about it?

$Si(OH)_4$ acid is produced at the end of hydrolysis of $SiCl_4$. Is this statement true or false?

The most basic oxide of elements in group $14$ of the periodic table is

An inorganic compound $(A)$ made of the two most abundant elements in the Earth's crust is used in building construction. When $(A)$ reacts with carbon,it forms a poisonous gas $(B)$,which is a very stable diatomic molecule. Identify compounds $(A)$ and $(B)$.

Assertion : $Pb^{4+}$ compounds are stronger oxidizing agents than $Sn^{4+}$ compounds.
Reason : The higher oxidation states for the group $14$ elements are more stable for the heavier members of the group due to 'inert pair effect'.