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Statement: The thermodynamics functions ...

Statement: The thermodynamics functions which determines the spontaneity of a process is the free energy. For a process to be spontaneous, the change in free energy must be negative.
Explanation:The change in free energy is related to the change in enthalpy and change in entropy. the change in entropy for a process must be always positive if it is spontaneous.

A

If both (A) and (R) are correct and (R) is the correct explanation for (A).

B

If both (A) and (R) are correct but (R) is not the correct explanation for (A).

C

If (A) is correct but (R) is incorrect

D

If (A) is incorrect but (R) is correct.

Text Solution

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The correct Answer is:
C
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Assertion (A): The thermodynamic factor which determines the spontaneity of a process is the free energy. For a process to be spontaneous the free energy must be-ve. Reason (R ) : The change in free energy is related to the change in a process must always be positive if its is spontaneous.

When spontaneous process occurs then free energy of a system

For a spontaneous chemical process, the free energy change is

Free energy change is related to enthalpy and entropy changes as:

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Entropy change in reversible adiabatic process is:

2nd Law of thermodynamics | Spontaneity of a reaction | Gibbs free energy

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