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Question

A system X is neither in thermal equilibrium with Y, nor with Z. The systems Y and Z -


A

Must be in thermal equilibrium

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B

Cannot be in thermal equilibrium

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C

May be in thermal equilibrium

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D

None of these

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Solution

The correct option is C

May be in thermal equilibrium


Let the temperatures of X, Y and Z be Tx, Ty and Tz, respectively.

Now,

Tx ≠ Ty,

and

Tx ≠ Tz.

This does not tell us anything about Ty and Tz, except that they are not equal to Tx.

So, Ty = Tz, and Ty ≠ Tz, both are possibilities!

Hence, option (c) is correct.


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