Which one of the following is formed apart from sodium chloride when chlorine reacts with hot concentrated sodium hydroxide?

Iodine can exhibit which of the following oxidation states?

For the reaction $Br_2 + F_2$ (excess) $\rightarrow P$, the molecular formula and structure of $P$, respectively, are

Which of the given methods cannot produce $Cl_2$?

The halogen acid used in the preparation of aqua regia is

Manganese dioxide on heating with concentrated hydrochloric acid gives a greenish yellow gas,$X$. With excess of ammonia,$X$ gives $Y$ and $Z$. $Y$ and $Z$ respectively are: