JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
The correct statement amongst the following is :
- A The term 'standard state' implies that the temperature is \(0^{\circ} \mathrm{C}\)
- B The standard state of pure gas is the pure gas at a pressure of 1 bar and temperature 273 K
- C \(\Delta_{\mathrm{f}} \mathrm{H}_{298}^\theta\) is zero for \(\mathrm{O}(\mathrm{g})\)
- D \(\Delta_{\mathrm{f}} \mathrm{H}_{500}^\theta\) is zero for \(\mathrm{O}_2(\mathrm{~g})\)
Answer & Solution
Correct Answer
(D) \(\Delta_{\mathrm{f}} \mathrm{H}_{500}^\theta\) is zero for \(\mathrm{O}_2(\mathrm{~g})\)
Step-by-step Solution
Detailed explanation
For standard state \(\Rightarrow\) pressure \(=1\) bar and temperature is specified only \(\Rightarrow\left(\Delta \mathrm{H}_{\mathrm{f}}^{\mathrm{o}}\right)_{\mathrm{O}_{2,(\mathrm{~g})}}=0\)
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