MCQ
At same temperature which pair of the following solutions are isotonic?
  • A
    $0.2 \mathrm{M} \mathrm{\sim BaCl}_2$ and $0.2 M$ urea
     
  • B
    $0.1M$ urea and $\text{0.1M NaCl}$
  • C
    $\text{0.1 M NaCl}$ and $0.1 \mathrm{M} \mathrm{\sim K}_2 \mathrm{SO}_4$
  • $0.1 \mathrm{M} \mathrm{\sim Ba}\left(\mathrm{NO}_3\right)_2$ and $0.1 \mathrm{M} \mathrm{\sim Na}_2 \mathrm{SO}_4$​

Answer

Correct option: D.
$0.1 \mathrm{M} \mathrm{\sim Ba}\left(\mathrm{NO}_3\right)_2$ and $0.1 \mathrm{M} \mathrm{\sim Na}_2 \mathrm{SO}_4$​
Isotonic solutions have the same osmotic pressure and same molar concentration.
The solution of $0.1 \mathrm{M} \mathrm{\sim Ba}\left(\mathrm{NO}_3\right)_2$ and $0.1 \mathrm{M} \mathrm{\sim Na}_2 \mathrm{SO}_4$​ are isotonic.
The osmotic pressure of $0.1 \mathrm{M} \mathrm{\sim Ba}\left(\mathrm{NO}_3\right)_2$​
$= \text{iMRT} = 3 \times 0.1RT = 0.3RT$
Osmotic pressure of $0.1M \mathrm{\sim Na}_2 \mathrm{SO}_4$
$= \text{iMRT} = 3 \times 0.1RT = 0.3RT$
The correct answer is "The solution of $0.1 \mathrm{M} \mathrm{\sim Ba}\left(\mathrm{NO}_3\right)_2$​ and $0.1M \mathrm{\sim Na}_2 \mathrm{SO}_4$ are isotonic".

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