Anhydrous mercurous chloride can be prepared by

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 $(B)$.

Carbon and silicon belong to group $IV$. The maximum coordination number of carbon in commonly occurring compounds is $4$,whereas that of silicon is $6$. This is due to

Pyrosilicate ion is

Which of the following statements is correct with respect to the properties of elements in the carbon family as the atomic number increases?

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.