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If 25 J is work is done on a system and same amount of heat is also supplied. What kind of system is it?

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If 25 J is work is done on a system and same amount of heat is also supplied. What kind of system is it?

(a) Steady state

(b) Unsteady state

(c) Closed

(d) None of the mentioned

I have been asked this question in final exam.

This intriguing question originated from Energy balance for Different type of systems in section Miscellaneous of Chemical Process Calculation

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Right answer is (b) Unsteady state

Easiest explanation: ∆E is not equal to zero.

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