Which of the following is useful in the preparation of chlorine?

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

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?

Among the following acids,the weakest one is

The bond dissociation energy is highest for

Explain the electron gain enthalpy values of elements of the $17^{\text{th}}$ group. Give reasons and explain.