Which member of the halogen $(X_2)$ group does not exhibit a positive oxidation state $(X_2^+)$?

Consider the following statements about the oxides of halogens:
$A$. At room temperature, $OF_2$ is thermally stable.
$B$. Order of stability of oxides of halogens is $I > Br > Cl$.
$C$. $I_2O_5$ is used in the estimation of $CO$.
$D$. $ClO_2$ is used as a bleaching agent.
The correct statements are:

Three parts of $conc. HCl$ and one part of $conc. HNO_3$ are mixed to form aqua regia. It is used to dissolve:

Mark the element which displaces three halogens from their compounds.

When chlorine is passed over dry slaked lime at room temperature,the main reaction product is

Which of the following is the strongest oxidizing agent?