Question

A system $X$ is neither in thermal equilibrium with $Y$ nor with $Z$ The system $Y$ and $Z$

• A. Must be in thermal equilibrium
• B. Cannot be in thermal equilibrium
• C. May be in thermal equilibrium
• D. None of the above statements are correct

Answer 1

Answer: (C)

May be in thermal equilibrium

Given: There is a system X which is neither in thermal equilibrium with Y nor with Z.

Solution:

1. According to Zeroth law of thermodynamics, if two bodies are each in thermal equilibrium with a different third body then they are also in equilibrium with each other.

2. Here, in the question X is neither in thermal equilibrium with Y nor with Z. But from the given data we cannot predict any relation between system Y and Z. So, Y and Z may be at thermal equilibrium or may not be at thermal equilibrium with each other.

Hence, option C is correct.