Discussion
Assertion (A): The Clapeyron equation relates the slope of a phase boundary to the latent heat.
Reason (R): Along a coexistence line the molar Gibbs energies of the two phases remain equal.
Answer: B
Both are true and the reason gives the derivation: differentiating that equality along the line produces the relation directly, with the volume change of the transition appearing in the denominator. It holds for melting and sublimation lines equally well.
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