Which of the following statements is/are correct? (a) Reversible adiabatic process is an isoentr...

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Which of the following statements is/are correct?
(a) Reversible adiabatic process is an isoentropic process.
(b) \( \Delta \mathrm{S}_{\text {system }} \) for irreversible adiabatic compression is greater than zero.
- (c) \( \Delta \mathrm{S}_{\text {system }} \) for free expension is zero.
- (d) \( \Delta \mathrm{S}_{\text {surrounding }} \) for irreversible isothermal compression is greater than zero.
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