The correct statement amongst the following is

The term 'standard state' implies that the temperature is \(0^\circ \mathrm{C}\)

The standard state of pure gas is the pure gas at a pressure of \(1\) bar and temperature \(273\mathrm{K}\)

\({\Delta }_{\mathrm{f}}{\mathrm{H}}_{298}^{\theta }\) is zero for \(\mathrm{O}(\mathrm{g})\)

\({\Delta }_{\mathrm{f}}{\mathrm{H}}_{500}^{\theta }\) is zero for \({\mathrm{O}}_{2}(\mathrm{g})\)