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  4. A beaker containing a mixture of liquid A and liquid B, in equilibrium with each other, is cooled very slowly. If point 'D' on the graph is where solidification of both liquids is complete, how many different phases coexist along line ' CD ' if freezing point of liquid B and liquid A are -25° C and -78° C respectively.

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Q. A beaker containing a mixture of liquid $A$ and liquid $B$, in equilibrium with each other, is cooled very slowly. If point '$D$' on the graph is where solidification of both liquids is complete, how many different phases coexist along line ' $CD$ ' if freezing point of liquid $B$ and liquid $A$ are $-25^{\circ} C$ and $-78^{\circ} C$ respectively.Chemistry Question Image

AP EAMCETAP EAMCET 2020

Solution:

At point ' $D$ ', solidification of both liquids, $A$ and $B$ takes place. So, along the line ' $C D$ ' on the graph four phases will co-exist, which are liquid $-A$, solid $-A$, liquid- $B$ and solid- $B$.