Bleaching action of $SO_2$ is due to its

$A$ 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:

Sulphur dioxide reacts with chlorine in the presence of charcoal to give

Although fluorine is more electronegative than oxygen,the ability of oxygen to stabilize higher oxidation states exceeds that of fluorine. Why?

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

Which one of the following properties is not correct for ozone?