MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistrySolutionsOsmotic pressure in colligative properties
Which of the following pairs of solutions is isotonic?
A.6% urea and 6% glucose (w/v)
B.18% urea and 18% glucose (w/v)
C.6% urea and 18% fructose (w/v)✓ Correct
D.34.2% sucrose and 60% glucose (w/v)
Explanation
Molarity of 6% Urea is given by: 0.6 10 M = 0.1 60 urea M x Osmotic pressure of 6% urea will be: 0.1 urea R T x x Molarity of 18% Fructose is given by: 1.8 10 0.1 180 fructose M M x Osmotic pressure of 6% urea will be: 0.1 fructose R T x x Since the osmotic pressure is the same, 6% of urea will be isotonic with 18% fructose.
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