This type of diagram (formed from equilateral triangles) is used for three-component mixtures and must be plotted in such a way that the compositions of all three components can be displayed.

• A. Ternary diagram
• B. Binary diagram
• C. Phase diagram
• D. Isobaric chart

Answer: (A)

The main idea here is how to visualize three-component mixtures on a single chart. A ternary diagram is drawn as an equilateral triangle, with each corner representing 100% of one component. Any point inside the triangle corresponds to a mixture where the three component fractions add up to 100%. Reading the diagram works by lines parallel to a triangle side; moving along such lines keeps one component constant, and the distance from a side reflects the fraction of that component. This makes it the best way to display all three compositions at once. Other diagrams serve different purposes: a binary diagram handles only two components, a phase diagram maps phases under variables like temperature and pressure, and an isobaric chart tracks properties at constant pressure rather than three-component compositions.