Consider the following statements.
1. There is no change in temperature when a liquid is being evaporated into vapour.
2. Vapour is a mixed phase of liquid and gas in the zone between saturated liquid line and saturated vapour line.
3. The saturated dry vapour curve is steeper as compared to saturated liquid curve on a T-s diagram.
4. The enthalpy of vaporization decreases with increase in pressure.
Which of the above statements are correct?
a) 1, 2 and 3 only (b) 3 and 4 only
c) 1, 2 and 4 only (d)1,2,3 and 4