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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
The entropy change can be calculated by using the expression $\Delta\text{S}=\frac{\text{q}_\text{rev}}{\text{T}}\ .$ When water freezes in a glass beaker, choose the correct statement amongst the following :
  • A
    $\Delta\text{S}_\text{(system)}$ decreases but $\Delta\text{S}_\text{(surrounding)}$ remains the same.
  • B
    $\Delta\text{S}_\text{(system)}$ increases but $\Delta\text{S}_\text{(surrounding)}$ decreases.
  • ✓
    $\Delta\text{S}_\text{(system)}$ decreases but $\Delta\text{S}_\text{(surrounding)}$ increases.
  • D
    $\Delta\text{S}_\text{(system)}$ decreases but $\Delta\text{S}_\text{(surrounding)}$ also decreases.
✓

Answer

Correct option: C.
$\Delta\text{S}_\text{(system)}$ decreases but $\Delta\text{S}_\text{(surrounding)}$ increases.
When water freezes, the heat is transferred from system to the surroundings, thus entropy of system decreases but entropy of surroundings increases.

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