Copper turnings when heated with concentrated sulphuric acid will give:

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.

Write the conditions to maximize the yield of $H_2SO_4$ by Contact process.

In the presence of moisture,$SO_2$ can

Which of the following compounds has the maximum number of oxo groups (terminal $O$ atoms bonded to the central atom by a double bond)?

Which of the following oxyacids of sulphur contains an $S-S$ linkage?