Which of the following halogen acids is least acidic?

Arrange the hydrohalic acids $(HX)$ of halogens in increasing order of acidity.

When $1 \ mol$ of fluorine reacts with $2 \ mol$ of hot and concentrated $KOH$,the products obtained are $KF$,$H_2O$,and $O_2$. The molar ratio of $KF$,$H_2O$,and $O_2$ produced is respectively:

Which of the following halogen oxides is ionic?

In chromyl chloride test,the oxidation state of $Cr$ changes from

In the following reaction, products $x$ and $y$ respectively, are
$P_4 + 10 SO_2Cl_2 \longrightarrow x + y$