Which substance is used as a gaseous insulator in high-voltage generators?

What are the products formed when moist chlorine gas is reacted with hypo?

The anhydride of perchloric acid $(HClO_4)$ is:

Identify the weakest halogen acid from the following.

Select the incorrect statement from the following.

Phosphorus reacts with $SO_2Cl_2$ to form $PCl_5$ and $X$. At $723 \ K$,$HCl$ gas reacts with $O_2$ in the presence of $CuCl_2$ to form water and $Y$. $Y$ reacts with $X$ in water to form two acids $A$ and $B$. What are $A$ and $B$ respectively?