Consider the following statements:
1. The entropy of a pure crystalline substance at absolute zero temperature is zero.
2. the efficiency of a reversible heat engine is independent of the nature of the working substance and depends only on the temperature of the reservoirs between which it operates.
3. Carnot’s theorem states that of all heat engines operating between a given constant temperature source and a given constant temperature sink, none has a higher efficiency than a reversible engine
Which of the above statements are correct?1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3