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Two systems each in thermal equilibrium with a third are in equilibrium:

AWith each other
BWith nothing else
CWith the wall
DWith the room
Answer & Solution
Correct answer: A. With each other
1. Systems A and B are each in equilibrium with system C. 2. The zeroth law draws a conclusion about A and B. 3. They are in thermal equilibrium with each other. _Source: NCERT Class 11 Physics Part II, Chapter 12, Thermodynamics._
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