The peroxydisulphuric acid has which of the following bond?

 

The molecular formula for dithionic acid is ______.

Which oxo$-$acid of sulphur contains the $\mathrm{S}-\mathrm{S}$ single bond?

Which oxo$-$acid of sulphur contains the $\mathrm{S}–\mathrm{S}$ bond in its structure?

In which pair of ions both the species contain $\mathrm{S}-\mathrm{S}$ bond?

Which of the following halogen does not exhibit the positive oxidation state in its compounds?

What is the highest oxidation state exhibited by group $17$ elements?

Which halogen has the highest value of the negative electron gain enthalpy?

The weakest acid $\mathrm{HX} (\mathrm{X}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I})$ is ______.