MHT CET · Chemistry · Thermodynamics (C)
Which of the following reactions exhibits decrease in entropy?
- A \(2 \mathrm{H}_2 \mathrm{O}_{2(l)} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(\mathrm{~g})}\)
- B \(\mathrm{H}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_{(\mathrm{g})}\)
- C \(\mathrm{CaCO}_{3(\mathrm{~s})} \xrightarrow{\Delta} \mathrm{CaO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}\)
- D \(2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}\)
Answer & Solution
Correct Answer
(D) \(2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}\)
Step-by-step Solution
Detailed explanation
\(2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}\) \(\Delta n_{gas} = 0 - (2+1) = -3\)
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