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Thermodynamic Processes

Which of the ...

Question

Which of the following is correct for any thermodynamic system?

A

The internal energy changes in all processes

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B

Internal energy and entropy are state functions

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C

The change in entropy can never be zero

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D

Heat gained or lost in an adiabatic process is always zero

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Solution

The correct option is C Heat gained or lost in an adiabatic process is always zero
An adiabatic process is one in which no heat is gained or lost by the system. The first law of thermodynamics with Q=0 shows that all the change in internal energy is in the form of work done.
Hence option D is correct.

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Q. Assertion :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: The change in free energy is related to the change in enthalpy and change in entropy. The change in entropy for a process must always be positive if it is spontaneous.

Q. Consider the following statements:

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Change in enthalpy is always smaller than change internal energy.

I I

. The variation in enthalpy of a reaction with temperature given by Kirchhoff's equation.

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. The entropy change in reversible adiabatic process is equal to zero.
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