Which of the following is the most powerful oxidizing agent?

In which of the following pairs does the first gas bleach flowers by reduction while the second gas does so by oxidation?

Iodine exists in which form in iodised salt?

For which one of the following properties of halogens does the sequence $F > Cl > Br > I$ hold good?

Concentrated $H_2SO_4$ is not used to prepare $HBr$ from $KBr$ because it

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A :$ Fluorine forms one oxoacid.
Reason $R :$ Fluorine has the smallest size amongst all halogens and is highly electronegative.
In the light of the above statements,choose the most appropriate answer from the options given below.