The number of six-membered and five-membered rings in Buckminster fullerene respectively is

$CO + NaOH \to $

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{C}Cl_4 + H_2O \longrightarrow \text{No reaction}$

Which of the following oxides is amphoteric?

Write the general and empirical formula of silicone.

Litharge $(PbO)$ is $NOT$ used in which of the following?