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} ) $

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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} ). $



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