Two identical gas samples are initially ...

Two identical gas samples are initially at same temperature and pressure. They are separatly taken into two cylinders of volume V (each) and are compressed to volume V/2 One isothermally and other adiabatically.
Entropy change for surroundings is

positive for adiabatic process

negative for adiabatic process

positive for isothermal process

zero for isothermal process

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