Engineering Thermodynamics
According to kinetic theory of gases, the absolute zero temperature is attained when

Volume of the gas is zero
Pressure of the gas is zero
Specific heat of gas is zero
Kinetic energy of the molecules is zero

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

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