JEE Advanced levelOne or more correct optionsDifficulty 3 of 3so091
Four aqueous solutions at 300K: (I) 0.10M glucose, (II) 0.10M urea, (III) 0.04MAlX2(SOX4)X3, (IV) 0.15MNaCl. Assume complete dissociation of electrolytes and ideal behaviour. Which of the following is/are correct? (R=0.0821Latmmol−1K−1)
ASolution III has a higher osmotic pressure than solution IV.
BSolutions I and II are isotonic.
CThe osmotic pressure of solution IV is 7.39atm (two decimals).
DSolution III has twice the osmotic pressure of solution I.
Answer: B, C, D
Particle concentrations: I 0.10, II 0.10, III 5×0.04=0.20, IV 2×0.15=0.30molL−1. So I and II are isotonic and III is twice I. For IV, π=0.30×0.0821×300=7.39atm. III (0.20) is lower than IV (0.30), so the last statement is wrong.