1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: Spontaneous process is an irreversible process and may be reversed by some external agency. Reason: Decrease in enthalpy is a contributory factor for spontaneity.

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Q. Assertion : Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason : Decrease in enthalpy is a contributory factor for spontaneity.

AIIMSAIIMS 2017Thermodynamics

Solution:

A process is spontaneous when $\Delta G <0$.
$\Delta G =\Delta H - T \Delta S .$
When $\Delta H <0$, it may lead to negative value for $\Delta G$.
A spontaneous process is an irreversible process and may be reversed by some external agency.
The decrease in enthalpy is a contributory factor for spontaneity.