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Chemical Thermodynamics — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryChemical Thermodynamics1 Mark
MCQ
For which among the followiag reactions, change in entropy is less than zero?
  • A
    Sublimation of iodine
  • B
    Dissociation of hydrogen
  • ✓
    Formation of water
  • D
    Thermal decomposition of calcium carbonate
✓

Answer

Correct option: C.
Formation of water
(c) : $\Delta S=S_{\text {products }}-S_{\text {reactants }}$
$
H _{2(g)}+\frac{1}{2} O _{2(g)} \longrightarrow H _2 O _{(l)}
$
Entropy of liquid is less than that of gases hence $\Delta S$ is negative for the formation of water.

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