‹ Back to the paper
An aqueous solution contains of protein in of water. The osmotic pressure of the solution at is …
(i)[2.0]
An aqueous solution contains $0\cdot63\text{ g}$ of protein in $300\text{ cm}^3$ of water. The osmotic pressure of the solution at $300\text{ K}$ is $1\cdot29 \times 10^{-3}\text{ atm}$. Calculate the molecular mass of protein.
(Given $R = 0\cdot0821\text{ Lit atm K}^{-1}\text{ mol}^{-1}$)
(ii)[1.0]
What mass of ethylene glycol must be added to $5\cdot50\text{ kg}$ of water to lower the freezing point of water from $0^\circ\text{C}$ to $-10\cdot0^\circ\text{C}$?
($K_f$ for water $= 1\cdot86^\circ\text{C kg mol}^{-1}$, molecular weight of ethylene glycol $= 62\cdot0\text{ g mol}^{-1}$)
(iii)[1.0]
Outer hard shells of two eggs are removed. One of the eggs is placed in saturated solution of sodium chloride and the other egg is placed in pure water. What change will be observed and why?
(iv)[1.0]
What would be the value of van’t Hoff factor for a dilute solution of $\text{K}_2\text{SO}_4$ in water. Assume that $\text{K}_2\text{SO}_4$ is completely ionised.
Answer
No answer yet.
From ISC 2026 Specimen Chemistry Paper 1, question 20.