Which is the stable crystalline form of sulfur at room temperature?

Which of the following is formed when $SO_3$ is absorbed by concentrated $H_2SO_4$?

In the case of hydrides of the oxygen family,which of the following physical properties changes regularly on moving down the group?

Which of the statements given below is incorrect?

Assertion : There is a large difference between the melting and boiling points of $O$ and $S$.
Reason : It can be explained on the basis of their atomicity in $O_2$ and $S_8$ molecules.

$H_2S$ is more acidic than $H_2O$,due to