Question

A particular state of system is arrived at starting from a given state in two different ways (1) following reversible path and (2) irreversible path. Which of the following relations would be correct if the processes are isothermal ?

• A. DS_rev¹DS_irrev
• B. Dq_rev=Dq_irrev
• C. DS_rev=DS_irrev = $\frac{\Delta q_{rev}}{T}$
• D. DS_irrev = $\frac{\Delta q_{irrev}}{T}$¹DS_rev

Answer 1

Answer: (C)

DS_rev=DS_irrev = $\frac{\Delta q_{rev}}{T}$

Answer 2

Since entropy is a state function, hence,

DS_rev = DS_irrev = $\frac{\Delta q_{rev}}{T}$