Anhydrous ferric chloride is prepared by

Which of the following elements is in a liquid state at room temperature?

$Na_2S_2O_3 \cdot 5H_2O$ is used in photography to

Which one of the following statements is not correct?

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