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Free expansion of gas against piston having friction is an example of which process?

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Free expansion of gas against piston having friction is an example of which process?

(a) Reversible

(b) Irreversible

(c) Cannot say

(d) None of the mentioned

I got this question at a job interview.

I need to ask this question from Ideal Reversible Processes in division Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

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Best answer
Right choice is (b) Irreversible

Best explanation: Free expansion of gas against piston having friction is irreversible process.

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