Which of the following will have the lowest vapour pressure

1.	Which of the following will have the lowest vapour pressure
A.	\[0.1M\,KCl\] solution
B.	\[0.1M\] urea solution
C.	\[0.1M\,N{{a}_{2}}S{{O}_{4}}\] solution
D.	\[0.1M\,{{K}_{4}}Fe{{(CN)}_{6}}\] solution
Answer» E.

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Which of the following will have the lowest vapour pressure

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