A) \[\pi V=\sqrt{in}RT\]
B) \[\Delta {{T}_{f}}=i{{K}_{f}}.m\]
C) \[\Delta {{T}_{b}}=i{{K}_{b}}.m\]
D) \[\frac{P_{solvent}^{0}-{{P}_{solution}}}{P_{solvent}^{0}}=i\left( \frac{n}{N+n} \right)\]
Correct Answer: A
Solution :
[a] 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, \[\frac{P_{solvent}^{{}^\circ }-{{P}_{solution}}}{P_{solvent}^{{}^\circ }}=i\left( \frac{n}{N+n} \right).\]
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