Question

Which of the following relationships is valid only for reversible processes undergone by a closed system of simple compressible substance (neglect changes in kinetic and potential energy)?

• A. $\delta Q=dU+\delta W$
• B. $TdS=dU+pdV$
• C. $TdS=dU+\delta W$
• D. $\delta Q=dU+pdV$

Answer 1

The correct option is D $\delta Q=dU+pdV$

(d)
$\delta Q=dU+pdV$
This equation holds good for a closed system when only pdV work is present. This is true only for a reversible (quasistatic) process.