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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then
  • A
    $\Delta H$ is $ - ve$, $\Delta S$ is $+ve$
  • ✓
    $\Delta H$ and $\Delta S$ both are $+ve$
  • C
    $\Delta H$ and $\Delta S$ both are $-ve$
  • D
    $\Delta H$ is $+ve$, $\Delta S$ is $-ve$
✓

Answer

Correct option: B.
$\Delta H$ and $\Delta S$ both are $+ve$
(b) $\Delta H$ and $\Delta S$ both are $+ve$ than reaction is spontaneous.

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