Q.

Which of the following variables are called state variables?

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a

Only pressure (p) and volume (V)

b

Only volume (V) and temperature (T)

c

Only pressure (p) and temperature (T)

d

Pressure, volume and temperature

answer is D.

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Detailed Solution

A state variable is a property of a system that depends only on the current, equilibrium state of the system and  thus do not depend on the path by which the system arrived at its present state.Examples: temperature, pressure, and volume.
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Which of the following variables are called state variables?