In the following, the oxoacid with a peroxy bond is

Assertion : Reaction of $SO_2$ and $H_2S$ in the presence of $Fe_2O_3$ catalyst gives elemental sulphur.
Reason : $SO_2$ is a reducing agent.

$A$ pale yellow solid molecule $(A)$ having crown shape is heated with conc. $H_2SO_4$. It gives a suffocating smell of gas $(B)$,which when passed through starch iodate paper,turns it blue. The gas $(B)$ is:

Which of the following oxoacids of sulfur contains a sulfur-sulfur $(S-S)$ double bond?

Explain the oxoacids of sulfur.

Ozone is prepared by passing silent electric discharge through oxygen. In this reaction,