Question:medium

Which of the following processes are reversible? I. Vaporization of a liquid at its boiling point. II. Expansion of gas into vacuum. III. Transformation of a solid substance into liquid at its melting point. IV. Neutralization of an acid by a base.

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In thermodynamics, reversible processes are idealized processes where the system is always infinitesimally close to equilibrium. Phase changes at the melting or boiling point are classic examples of reversible processes. Spontaneous, rapid processes like free expansion or chemical reactions are generally irreversible.

Updated On: Mar 30, 2026

I & III
II & III
II & IV
I & IV

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The Correct Option is A

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