Which of the following pairs of solution is isotonic? (molar mass. urea $=60$, sucrose $=342 \mathrm{~g}…

Which of the following pairs of solution is isotonic? (molar mass. urea $=60$, sucrose $=342 \mathrm{~g} \mathrm{~mol}^{-1}$ )
  1. $3 \cdot 0 \mathrm{~g} \mathrm{~L}^{-1}$ urea and $17 \cdot 19 \mathrm{gL}^{-1}$ sucrose
  2. $0 \cdot 3 \mathrm{gL}^{-1}$ urea and $1 \cdot 719 \mathrm{gL}^{-1}$ sucrose
  3. $3 \cdot 0 \mathrm{gL}^{-1}$ urea and $1 \cdot 719 \mathrm{gL}^{-1}$ sucrose
  4. $0 \cdot 3 \mathrm{~g} \mathrm{~L}^{-1}$ urea and $17 \cdot 19 \mathrm{gL}^{-1}$ sucrose

Solution

For isotonic solution, $\pi_{\text {ures }}=\pi_{\text {sucrose }}$ $\begin{array}{l} \mathrm{n}_{\text {urea }}=\mathrm{n}_{\text {oucinose }} \\ \frac{3.0}{6.0}=\frac{17.19}{343}=0.05 \mathrm{~mol} \end{array}$

Asked in: MHT CET 2020 (12 Oct Shift 1)

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