Which of the following statements about the P-V diagram of an ideal gas of fixed number of particles is incorrect?

• A

  Two distinct adiabats never cross each other.
• B

  Two distinct isotherms never cross each other.
• C

  An isotherm and an adiabat intersect at one point.
• Correct answer
  D

  An isotherm and an adiabat intersect at more than one point.

Hence, the correct answer is option: 'D'.