The following figure is a melting point composition diagram for a mixture of com

Question

The following figure is a melting point composition diagram for a mixture of compounds A and B. One fact that we can conclude from this diagram is: a) all mixtures of A and B have lower melting points than either A or B; b) adding that of pure A; OR c) adding 80% B to A results in a melting point higher than pure B. 1. 20% B to A lowers the observed meting point from Liquid selution of A+B Liquid solution + selid B Liquid selution I Sold A oidB 80 20 60 40 40 60 20 80 NA 100 Composition, trol%) Figure 4.9 Melting point composition diagram for the binary mixture, A + B. In this diagram, a is the melting point of the solid A b of solid B, e of eutectic mixture E, and m of the 80% A20% B mixture, M.

Explanation / Answer

Statement (b) is right.

Some of the mixtures of A and B have melting points higher than compound A. This is in the case of mixtures with percentage of B 80 or higher. Adding 80% B to A results in a melting point higher than pure A but lower than pure B.

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