Consider the following statements.
1. Gases have a very low critical temperature.
2. Gases can be liquefied by isothermal compression.
3. In engineering problems, water vapor in atmosphere is treated as an ideal or perfect gas.
Which of the above statements are correct?
(a) 1 and 2 only (b)2 and 3 only
(c) 1 and 3 only (d) 1, 2 and 3