Which of the following oxoacids of sulfur contains a sulfur-sulfur $(S-S)$ double bond?

What are the values of electron gain enthalpy in groups $16$ and $17$? How do they change?

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:

Write a note on oxides of group-$16$ elements.

What is formed when $H_2S$ reacts with $O_2$?

Given below are two statements:
Statement $I$: The boiling points of the following hydrides of group $16$ elements increase in the order: $H_2O < H_2S < H_2Se < H_2Te$.
Statement $II$: The boiling points of these hydrides increase with an increase in molar mass.
In the light of the above statements,choose the most appropriate answer from the options given below: