Which one of the following statements is not correct?

What happens when:
$(i)$ Concentrated $H_2SO_4$ is added to calcium fluoride
$(ii)$ $SO_3$ is passed through water?

Which element from the following does $NOT$ belong to the chalcogen family?

What is produced by the dehydration of concentrated $H_2SO_4$ in the presence of $P_4O_{10}$?

Sodium thiosulphate is prepared by:

Given below are two statements:
Statement $I$: The boiling point of hydrides of Group $16$ elements follows the order
$H_2O > H_2Te > H_2Se > H_2S$.
Statement $II$: On the basis of molecular mass,$H_2O$ is expected to have a lower boiling point than the other members of the group,but due to the presence of extensive $H$-bonding in $H_2O$,it has a higher boiling point.
In the light of the above statements,choose the correct answer from the options given below: