Which of the following is an amphoteric oxide?

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'.

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

Which type of glass is used in the manufacturing of lenses and prisms?

In the laboratory,silicon can be prepared by the reaction:

The silicate having one monovalent corner oxygen atom in each $SiO_4$ tetrahedron unit is: