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Discussion :: Chemical Engineering Thermodynamics

  1. Entropy of a substance remains constant during a/an __________ change.

    2. A.

     Reversible isothermal
    B.

     Irreversible isothermal
    C.

     Reversible adiabatic
    D.

     None of these

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    Answer : Option C

    Explanation :

    Since only for a reversible process we have relation :
    TdS=δQ
    Since for an adiabatic process δQ=0 ⇒ for an reversible adiabatic process TdS=0.
    So, entropy remains constant. Whereas for an irreversible adiabatic process TdS⩾0.
    Hence entropy goes on increasing for an irreversible adiabatic process.

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