Which one of the following correctly represents the order of stability of oxides,$X_{2}O$ $(X = \text{halogen})$?

Hydrofluoric acid $(HF)$ cannot be stored in glass bottles because it reacts with glass to form which of the following?

Mercury on heating with aqua-regia gives

$SO_2$ acts as a temporary bleaching agent,while $Cl_2$ acts as a permanent bleaching agent. Why?

What is the molecular formula of hypochlorous acid?

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 :