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  1. Considering the relationship TdS = dU + pdV between the entropy (S), internal energy (U), pressure (p), temperature (T) and volume (V), which of the following statements is correct?
    1. It is applicable only for a reversible process
    2. For an irreversible process, TdS > dU+ pdV
    3. It is valid only for an ideal gas
    4. It is equivalent to 1st law, for a reversible process
Correct Option: D

The equation is valid for between reversible or inversible process of a closed system. Because it is the relation between properties which are independent to path.



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