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Question
Which of the following 0.1 M will aqueous solutions exert highest osmotic pressure?
(a) `Al_2(SO_4)_3`
(b) `Na_2SO_4`
(c) `MgCl_2`
(d) KCl
Solution
`Al_2(SO_4)_3`
`Al_2SO_4 -> 2Al^(3+) + 3SO_4^(2-) ` (5 particles)
`Na_2SO_4 -> 2Na^(+) + SO_4^(2-)` (3 particles)
`MgCl_2 -> Mg^(2+) + 2Cl^(-)` (2 particles)
`KCl -> K^+ Cl^(-)` (2 particles)
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