Which of the following is an extensive property of a system ?

A. Enthalpy does not remain constant
B. Entire apparatus is exposed to surroundings
C. Temperature remains constant
D. None of these

A. SO2
B. NH3
C. CCl2F2
D. C2H4Cl2

A. +ve
B. -ve
C. 0
D. Either of the above three; depends on the nature of refrigerant

A. Moisture free ice
B. Solid helium
C. Solid carbon dioxide
D. None of these

A. 3
B. 2
C. 1
D. 0

A. Tds = dE + dW
B. dE – dW = Tds
C. dW – dE = Tds
D. Tds – dW + dE >0