Fluorine reacts with water to give

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

Which of the following is a strong oxidizing agent used in the purification of water?

$A$ solid $A$ which has photographic effect reacts with the solution of a sodium salt $B$ to give a pale yellow precipitate $C$. The sodium salt $B$ on heating with concentrated $H_2SO_4$ gives brown vapours. Identify $A$,$B$,and $C$.

The reaction of concentrated $HNO_3$ with iodine produces ....

Which of the following represents the correct order of bond energy?