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What happens to entropy when a close system undergoes an irreversible process?

What happens to entropy when a close system undergoes an irreversible process? Correct Answer Can increase, decrease or remain constant

If a closed system is undergoing an irreversible process, the change in entropy of the system is given by

dS > 0, or dS = 0, or dS < 0

In an irreversible process in which heat is removed from the system then its entropy can decrease. 

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