The acid having $O - O$ bond is

What is true about $H_2S_nO_6$ (Polythionic acid)?

Given below are two statements:
Statement $I$: Oxygen being the first member of group $16$ exhibits only $-2$ oxidation state.
Statement $II$: Down the group $16$ stability of $+4$ oxidation state decreases and $+6$ oxidation state increases.
In the light of the above statements,choose the most appropriate answer from the options given below:

The bleaching action of $SO_2$ is due to its:

Which of the following oxyacids of sulphur contains both $S=S$ and $S=O$ bonds?

Identify the incorrect statement.