Mark the element which displaces three halogens from their compounds.

$MnO_{2} + HCl \xrightarrow{\Delta} A_{(g)}$
$A_{(g)} + F_{2} (\text{excess}) \rightarrow B_{(g)}$
$B_{(l)} + U_{(s)} \rightarrow C_{(g)} + D_{(g)}$
The gases $A$,$B$,$C$ and $D$ are respectively

Fluorine is a stronger oxidising agent than chlorine because :
$(a)$ $F-F$ bond has a low enthalpy of dissociation.
$(b)$ Fluoride ion $(F^{-})$ has high hydration enthalpy.
$(c)$ Electron gain enthalpy of fluorine is less negative than chlorine.
$(d)$ Fluorine has a very small size.
Choose the most appropriate answer from the options given :

What is the correct order of bond dissociation enthalpy for $N_2, O_2, F_2$ and $Cl_2$?

With cold and dilute sodium hydroxide,fluorine reacts to give:

Which of the following halogens produces oxygen when passed through a hot and concentrated solution of $KOH$?