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# Which one of the following completely dissociated salt solutions will give the lowering of vapour pressure double from its theoretical value?

$\begin{array}{1 1}(a)\;KCl\\(b)\;MgCl_2\\(c)\;BaCl_2\\(d)\;Na_2SO_4\end{array}$

Answer: $Kcl$ whose van't Hoff factor is 2.
Hence (a) is the correct answer.
edited Jul 16, 2014