Which is the best reducing agent?

When chlorine reacts with a cold and dilute solution of sodium hydroxide,the products obtained are:

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 :

Aqua regia is a mixture of

Which of the following substances is the most volatile?

Identify the incorrect statement among the following.