Solutions Question 338
Question: If the various terms in the given below expressions have usual meanings, the van’t Hoff factor (i) cannot be calculated by which one of the following expressions
Options:
A) $ \pi V=\sqrt{in}RT $
B) $ \Delta T_{f}=iK_{f}.m $
C) $ \Delta T_{b}=iK_{b}.m $
D) $ \frac{P_solvent^{0}-P_{solution}}{P_solvent^{0}}=i( \frac{n}{N+n} ) $
Show Answer
Answer:
Correct Answer: D
Solution:
Van’t Hoff equation is $ nV=inRT $ For depression in freezing point. $ \Delta T_{f}=i\times K_{f}\times m $ For elevation in boiling point. $ \Delta T_{b}=i\times K_{b}\times m $ For lowering of vapour pressure, $ \frac{P_solvent^{{}^\circ }-P_{solution}}{P_solvent^{{}^\circ }}=i( \frac{n}{N+n} ). $
