Which of the following processes can not be made reversible even under ideal condition of operation?

Which of the following processes can not be made reversible even under ideal condition of operation? Correct Answer Free expansion of a gas

A reversible process means the process in which both system and surroundings both should be restored to their original conditions when the system is bought to initial conditions. Since in case of free expansion of gas it is not possible to bring back the surroundings to initial state when system is brought back to initial conditions we call it as an irreversible process.
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