A) \[0.05\]
B) \[0.04\]
C) \[0.02\]
D) \[0.01\]
Correct Answer: C
Solution :
: The relative lowering of vapour pressure is given by \[\frac{{{P}^{o}}-{{P}_{s}}}{{{P}^{o}}}=\frac{{{n}_{2}}}{{{n}_{1}}+{{n}_{2}}}\] For a dilute solution, \[{{n}_{2}}\] can be neglected, then \[\frac{{{P}^{o}}-{{P}_{s}}}{{{P}^{o}}}=\frac{{{n}_{2}}}{{{n}_{1}}}=\frac{3/60}{45/18}=0.02mm\] (where, \[{{n}_{2}}\] for urea and \[{{n}_{1}}\] for water)
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