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# Which of the following has the maximum osmotic at temperature T?

$\begin{array}{1 1}(a)\;\text{50ml of 1M urea solution}\\(b)\;\text{100ml of 1M glucose solution}\\(c)\;\text{mixture of 50ml of 1M urea solution and 100ml of 1M glucose solution}\\(d)\;\text{all are isotonic}\end{array}$

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Answer: (D) All are isotonic
For dilute solutions, osmotic pressure is proportional to the molarity, C of the solution at a given temperature T.
In this case, at a given temperature T, all solutions have the same molarity 1M and hence the same osmotic pressure.