The commercial name of peroxydisulphuric acid is:

Among chalcogens,the correct order of amount of energy released during electron gain (electron gain enthalpy) is

The incorrect statement$(s)$ about $O_3$ is (are):

In the preparation of sulphuric acid from sulphur dioxide in the lead chamber process,what substance is used as a catalyst?

Permono sulphuric acid is known as

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.