Which of the following pair of solutions can be expected to be isotonic at the same temperature?

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0.1 M urea & 0.1 M NaCl

0.1 M urea & 0.1 M glucose

500 ml 0.2 M NaCl & 200 ml 0.2 N KCl

100 ml 0.05 N Ca(NO₃)₂ & 100 ml 0.15 M Na₂SO₄

answer is B, C.

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Detailed Solution

Isotonic solutions have same osmotic pressures.
0.1M Urea ; 0.1M C₆H₁₂O₆
Same concentration and i = 1 for both
For NaCl and KCl n-factor is 1
$∴$ 0.2 M NaCl and 0.2 N KCl have same
osmotic pressure.

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