Q.

Which of the following will have the lowest vapour pressure

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a

O. l M KCl solution

b

O. l M urea solution 

c

0.l M Na2SO4 solution 

d

0.l M K4 Fe(CN)6 solution

answer is D.

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Detailed Solution

K4Fe(CN)6  gives maximum ions. Hence it have lowest vapour pressure. 

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