A) \[i={{\pi }_{obs}}\times {{\pi }_{cal}}\]
B) \[i={{\pi }_{obs}}+{{\pi }_{cal}}\]
C) \[i={{\pi }_{obs}}-{{\pi }_{cal}}\]
D) \[i=\frac{{{\pi }_{obs}}}{{{\pi }_{cal}}}\]
Correct Answer: D
Solution :
van't Hoff factor (i) is given by \[i=\frac{\text{observed}\,\text{value}\,\text{of}\,\text{colligative}\,\text{property}}{\text{normal}\,\text{value}\,\text{of}\,\text{colligative}\,\text{property}}\] The normal value of colligative property is the theoretically calculated value assuming no association or dissociation. \[\therefore \] \[i=\frac{{{\pi }_{obs}}}{{{\pi }_{cal}}}\]
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