Consider the following statements:
A. Zeroth law of thermodynamics gives concept of temperature
B. First law of thermodynamics gives concept of internal energy
C. In isothermal expansion of ideal gas, \(\Delta Q \neq \Delta W\)
D. Product of intensive and extensive variables is extensive
E. The ratio of any extensive variable to mass will be an extensive variable
Choose the correct combination of statements from the options given below:

Statement A is correct because the zeroth law of thermodynamics defines temperature and thermal equilibrium.

Statement B is correct because the first law of thermodynamics introduces the concept of internal energy through the equation \(\Delta Q = \Delta U + \Delta W\).

Statement C is incorrect because for an isothermal expansion of an ideal gas, the change in internal energy \(\Delta U = 0\). According to the first law of thermodynamics, \(\Delta Q = \Delta W\).

Statement D is correct because if an intensive variable (which is independent of the size of the system) is multiplied by an extensive variable (which is directly proportional to the size of the system), the product will be directly proportional to the size of the system, making it an extensive variable.

Statement E is incorrect because the ratio of two extensive variables (like any extensive variable and mass) is independent of the size of the system, making it an intensive variable.

Therefore, only statements A, B, and D are correct.

Answer: A, B and D Only