Which of the following is not true?

If $E^{\circ }\left({\mathrm{M}}^{n+}\mid \mathrm{M}\right)$ is positive, ${\mathrm{M}}^{n+}$ can be reduced to M by ${\mathrm{H}}_2\left(\mathrm{g}\right)$ under standard conditions

If $E^{\circ }\left({\mathrm{M}}^{n+}\mid \mathrm{M}\right)$ is negative, ${\mathrm{H}}^{+}$ will be reduced to ${\mathrm{H}}_2$ by the metal Munder standard conditions

The compounds of active metals such as Zn, Na and Mg are reducible by ${\mathrm{H}}_2$ under standard conditions while those of noble metals such as Cu, Ag and Au are not reducible by ${\mathrm{H}}_2$ .

Sign of electrode potential determines the nature of the electrode (whether positive or negative terminal) of a cell whose other electrode is standard hydrogen electrode and the cell has a positive emf