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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Which of the following pairs of a chemical reaction is certain to result in spontaneous reaction ?
  • A
    Exothermic and decreasing disorder
  • B
    Endothermic and increasing disorder
  • ✓
    Exothermic and increasing disorder
  • D
    Endothermic and decreasing disorder
✓

Answer

Correct option: C.
Exothermic and increasing disorder
(c) $\Delta G = \Delta H - T\Delta S$
for spontaneous process $\Delta G$ should be negative in option $(3)$ $\Delta H = - ve\;{\rm{and}}\;\Delta S = + ve$ than
$\Delta G = ( - ve) - T( + ve)$ $ = - \,ve$

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