MHT CET · Chemistry · Thermodynamics (C)
Which among the following reactions exhibits \(\Delta \mathrm{H}=\Delta \mathrm{U} ?\)
- A \(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Br}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{HBr}_{(\mathrm{g})}\)
- B \(2 \mathrm{CO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}\)
- C \(\mathrm{PCl}_{5(\mathrm{~g})} \rightarrow \mathrm{PCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}\)
- D \(\mathrm{C}_{(\mathrm{s})}+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{g})} \rightarrow 2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{CO}_{2(\mathrm{~g})}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Br}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{HBr}_{(\mathrm{g})}\)
Step-by-step Solution
Detailed explanation
When \(\Delta \mathrm{n}_{\mathrm{g}}=0, \Delta \mathrm{H}=\Delta \mathrm{U}\). For reaction (A), \(\Delta \mathrm{n}_{\mathrm{g}}=0\).
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