Q. Observe the following abbrevations $\pi_{obs} =$ observed colligative property $\pi_{cal} =$ theoretical colligative property assuming normal behaviour of solute. Van’t Hoff factors (i) is given by
A) $i = \pi_{obs}\ \times \pi_{cal}\$
B) $i = \pi_{obs} + \pi_{cal}\$
C) $i = \pi_{obs} - \pi_{cal}\$
D) $i = \frac{\pi_{obs}}{\pi_{cal}\ }$
Explanation
(d)
Van’t Hoff factor (i) is given by
$i = \frac{observed\ value\ of\ colligative\ property}{normal\ value\ of\ colligative\ property\ }$
The normal value of colligative property is the theoretically calculated value assuming no association or dissociation.
$\therefore\ \ \ \ \ \ \ \ \ \ \ \ i = \frac{\pi_{obs}}{\pi_{cal}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.