State the various statements of second law of thermodynamics.

1.	State the various statements of second law of thermodynamics.
Answer» Solution :(i)Entropy statement: Whenever a SPONTANEOUS process TAKES place, it is accompanied by an increase in the total entropy of the universe" (II)Kelvin-Planck statement: It is impossible to take heat from a hotter reservoir and convert it completely into WORK by a cyclic process without transferring a part of heat to a cooler reservoir (iii)Efficiency statement: Even an ideal, frictionless engine cannot convert 100% of its input heat into work. Efficiency =`(T_1-T_2)/T_1` % Efficiency =`[(T_1-T_2)/T_1]xx100` % Efficiency =`["Output"/"Input"]xx100` % Efficiency < 100% (iv)Clausius statement: Heat flows spontaneously from hot objects to cold objects and to get it FLOW in the opposite direction, we have to spend some work.

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