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Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are. A. 1 M aq. NaCl and 2 M aq. urea B. 1 M aq. CaCl2 and 1.5 M aq. KCl C. 1.5 M aq. AlCl3 and 2 M aq. Na2SO4 D. 2.5 M aq. KCl and 1 M aq. Al2(SO4)3

1. [4]
2. [3]
3. [2]
4. [1]

Correct answer: [4]

Solution

The correct option is right because isotonic solutions have the same osmotic pressure, which depends on the total concentration of solute particles in solution. In the given pairs, all combinations yield equal effective concentrations of solute particles, confirming that they are isotonic.

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