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CUET · CHEMISTRY · PYQ PAPER 2023

Osmotic pressure measurements are less accurate and difficult to carry out. Therefore, this method is not useful for measuring molecular weights. But it is used to find out molecular weights of polymers eg. plastics, proteins and starch having many monomer units. Knowing the value of osmotic pressure of a given solution, molecular weight of the solute can be calculated using Van't Hoff equation.
An aqueous solution of salt contains 20 g of NaCl per liter. The pressure of solution at 35 \(^{\circ}\text{C}\) will be:

  1. A 8.622 atm
  2. B 7.398 atm
  3. C 2.79 atm
  4. D 4.43 atm
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Answer & Solution

Correct Answer

(A) 8.622 atm

Step-by-step Solution

Detailed explanation

\(M_{\text{NaCl}} = 22.99 + 35.45 = 58.44 \text{ g/mol}\) \(C = \frac{20 \text{ g}}{58.44 \text{ g/mol} \times 1 \text{ L}} = 0.3422 \text{ mol/L}\) \(T = 35 + 273 = 308 \text{ K}\) \(\Pi = iCRT\)…
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