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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Identify the correct statement regarding a spontaneous process :
  • A
    Lowering of energy in the process is the only criterion for spontaneity.
  • ✓
    For a spontaneous process in an isolated system, the change in entropy is positive.
  • C
    Endothermic processes are never spontaneous.
  • D
    Exothermic processes are always spontaneous.
✓

Answer

Correct option: B.
For a spontaneous process in an isolated system, the change in entropy is positive.
b
Spontaneity of reaction depends on tendency to acquire minimum energy state and maximum randomness. For a spontaneous process in an isolated system the change in entropy is positive.

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