Which of the following acids is the most acidic?

Chlorine reacts with hot and concentrated $NaOH$ and produces compounds $(X)$ and $(Y)$. Compound $(X)$ gives a white precipitate with silver nitrate solution. The average bond order between $Cl$ and $O$ atoms in $(Y)$ is

Among the following,which is the strongest oxidising agent?

The element exhibiting the most stable $+2$ oxidation state among the following is

$Br_2 + F_2$ (Excess) $\xrightarrow{\Delta} BrF_5$. When $F_2$ is diluted with $N_2$ gas,then the product of $Br$ would be:

Which of the following is not a mineral of fluorine?