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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 co-exist along line ' (C D ) ' if freezing point of liquid (B ) and liquid (A ) are (-25^ C ) and (-78^ C ) respectively.

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

D. 4

Step-by-step 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 ).

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