Mark the correct options:
a) A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z may be in thermal equilibrium with each other.
b) A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z are not in thermal equilibrium with each other.
c) A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z must be in thermal equilibrium with each other.
d) A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z may be in thermal equilibrium with each other.

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a and b are correct

a, b and d are correct

b and d are correct

a and c are correct

answer is C.

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Detailed Solution

Thermal equilibrium means sameness of temperature. Two bodies reach thermal equilibrium when they attain to same temperature.

A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z are not in thermal equilibrium with each other. This statement means X and Y have same temperature but temperature of Y is different from X's. This clearly implies temperature of Y is different from Z's.

A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z may be in thermal equilibrium with each other. This statement means temperature of A is different from that of Y and also of Z. It implies Y and Z may or may not have same temperature.

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