Which of the following aqueous solutions should have the highest osmotic pressure? (a) \( 0.011 ...

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Which of the following aqueous solutions should have the highest osmotic pressure?
(a) \( 0.011 \mathrm{M} \mathrm{AlCl}_{3} \) at \( 50^{\circ} \mathrm{C} \)
(b) \( 0.03 \mathrm{M} \mathrm{NaCl} \) at \( 25^{\circ} \mathrm{C} \)
(c) \( 0.012 \mathrm{M}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \) at \( 25^{\circ} \mathrm{C} \)
(d) \( 0.03 \mathrm{M} \mathrm{NaCl} \) at \( 50^{\circ} \mathrm{C} \)
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