The correct statement amongst the following is $:$
- AThe term 'standard state' implies that the temperature is $0^{\circ} C$
- BThe standard state of pure gas is the pure gas at a pressure of $1 \ bar$ and temperature $273 \ K$
- C$\Delta_{f} H_{298}^{\theta}$ is zero for $O_{(g)}$
- D$\Delta_{f} H_{500}^{\theta}$ is zero for $O_{2(g)}$
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