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Consider separate solutions of $0.500\; M$ $C_2 H_5 OH (aq),0.100M $$Mg_3(PO_4)_2(aq),0.250M KBr(aq)$ and $0.125\; M$ $Na_3PO_4(aq)$ at $25^{\large\circ}C$.Which Which statement is true about these solutions, assuming all salts to be strong electrolytes ?

$\begin{array}{1 1}(A)\;0.125M\;Na_3PO_4\text{(aq) has the highest osmotic pressure.}\\(B)\;0.500 M\;C_2H_5OH\text{(aq) has the highest osmotic pressure}\\(C)\;\text{They all have the same osmotic pressure.}\\(D)\;0.100M\;Mg_3(PO_4)_2\text{(aq) has the highest osmotic pressure.}\end{array} $

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They all have the same osmotic pressure.
Hence (C) is the correct answer.
answered Apr 7, 2014 by sreemathi.v

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