p-Block Elements Questions

Urea reacts with water to form $A$ which will decompose to form $B$. $B$ when passed through $C{u}^{2+}(aq)$, deep blue colour solution $C$ is formed. What is the formula of $C$ from the following?

Identify the correct statements from the following:(a) ${\text{CO}}_2(g)$ is used as refrigerant for ice-cream and frozen food.(b) The structure of ${\text{C}}_{60}$ contains twelve six carbon rings and twenty five carbon rings.(c) $\text{ZSM-5}$, a type of zeolite, is used to convert alcohols into gasoline.(d) $\text{CO}$ is colorless and odourless gas.

Which of the following oxoacid of sulphur has $-O-O-$ linkage?