Question
In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K .
C. $2{NaHCO}_{3(\text{ }s)} \rightarrow {Na}_{2}{CO}_{3(\text{ }s)} + {CO}_{2(\text{ }g)} + H_{2}O_{(g)}$
D. ${Cl}_{2(\text{ }g)} \rightarrow 2{Cl}_{(g)}$
Choose the correct answer from the options given below:
Options
Solution
Sol. [Key Concept: Entropy changes]
A increases entropy because vaporisation produces a more dispersed gas. C increases entropy because gaseous CO₂ and H₂O are produced from solids. D increases entropy because one mole of Cl₂ gas forms two moles of gaseous atoms. Cooling a crystalline solid in B decreases its thermal entropy. Thus A, C and D are selected, option (1).
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