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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?
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- It is applicable only for a reversible process
- For an irreversible process, TdS > dU+ pdV
- It is valid only for an ideal gas
- 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.