Which of the following statements about the electrochemical series are correct?

AAny metal with a negative standard reduction potential can, thermodynamically, liberate $H X_{2}$ from $1 M$ HCl
BThe more positive $E^{\circ} (M X^{+} / M)$ is, the stronger M is as a reducing agent
CThe order of oxidising power $F X_{2} > Cl X_{2} > Br X_{2} > I X_{2}$ follows directly from their $E^{\circ}$ values
DLi has a more negative $E^{\circ}$ than Na, although Li has the higher ionisation enthalpy, because of the very large hydration enthalpy of $Li X^{+}$

Answer: A, C, D

A: for

E^{\circ} (M X^{n +} / M) < 0

, the cell

M ∣ M X^{n +} ∣∣ H X^{+} ∣ H X_{2}

has positive EMF, so hydrogen evolution is thermodynamically allowed (kinetics may be slow, e.g. Pb). B is reversed: a more positive

E^{\circ}

means a stronger oxidising

M X^{+}

and a weaker reducing M. C:

2.87 > 1.36 > 1.09 > 0.54 V

gives the stated order. D: the small

Li X^{+}

ion is strongly hydrated, which more than compensates its higher ionisation enthalpy, giving

E^{\circ} = - 3.05 V

versus

- 2.71 V

for Na.