Phosphorus has the oxidation state of $+3$ in

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

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'.

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

Which of the following acids is formed when $SiF_4$ reacts with water?

What are the properties of carbon nanotubes?