On the phase diagram below the critical point is the line representing melting i

Question

On the phase diagram below the critical point is the line representing melting is and the line representing sublimation is D B to C A to F E A to B A to F G A to B A to F D A to B A to F D A to F B to C The heating curve below was generated by measuring the temperature of a compound which is a solid at point A as heat was added at a constant rate. The line segment is related to the heat of vaporization of the liquid and the line segment is related to the heat capacity of the compound in the gaseous state. AB BC BC CD CD DE DE EF CD EF

Explanation / Answer

Critical point is a point above which a gas can not be liquified. When a solid is heated at constant pressure, it starts melting. during sublimation a solid directly becomes vapor. Accordingly, E is critical point. A to B is melting and A to F is sublimation. ( B is correct)

When a liquid is supplied with latent heat of vaporization, it becomes vapor at constant temperature and when sensible heat is supplied to be vapor, the temperature changes. Accordingly, DE is vaporization and E to F is sensible heat addition to vapor. ( d is correct)

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