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A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kgK  to 0.4 kJ/kgK. At the same time, the entropy of the surroundings decreases form  80 kJ/K to 75 kJ/K. The process is

a) Reversible and isothermal

b) Irreversible

c) Reversible

d) Impossible

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