Question
Chemistry Question on Thermodynamics
Which one is incorrect statement of the second law of thermodynamics ?
A
It is impossible for a cyclic process to transfer heat from a system at a lower temperature to one at a higher temperature without converting some work to heat
B
It is impossible to convert heat completely into equivalent amount of work without producing changes elsewhere
C
Every perfect machine working reversibly between the same temperatures of source and sink has the same efficiency whatever be the nature of the substance used
D
Heat engines can be made 100% efficient
Answer
Heat engines can be made 100% efficient
Explanation
Solution
A heat engine cannot have 100% efficiency.