Question

For the given graph, which parameters will be non-zero?

• A. Q
• B. ∆H
• C. ∆U
• D. ∆S

Answer 1

Answer: (A)

Q

Points to remember:
$\Rightarrow$ change in state functions for cyclic process is zero e.g. entropy , internal energy and enthalpy.
$\Rightarrow$ change in path function for cyclic process may or may not be zero, it depends on the path.
Example:$\Rightarrow$

The process is cyclic through path A and Path B and both paths are different then $\Delta (Pathfuction\ne 0)$ like as $\Delta Q$
$\Rightarrow$ if path is the same for a cyclic process:

then $\Delta (Pathfuction=0)$ e.g. $Q$
$Q=0$