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CUET · CHEMISTRY · PYQ PAPER 2025

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A homogeneous mixture of two or more than two components has uniform composition and properties. The binary solutions have two components, which may be solid, liquid or gas. The resultant solution has a larger amount of solvent and a smaller amount of solute. The amount of solute in a given amount of solvent decides the concentration of the resulting solution. The concentration can be expressed in various ways, like molarity, molality, normality and mole fraction. The molality of a 1 liter aqueous solution of \(93 \backslash \% H _2 SO _4\) (mass/volume) is:
(Given: density of the solution \(=1.84 g mL ^{-1}\), molar mass of \(\left.H _2 SO _4=98 g mol ^{-1}\right)\)

  1. A \(10.43 mol kg ^{-1}\)
  2. B \(9.49 mol kg ^{-1}\)
  3. C \(18.4 mol kg ^{-1}\)
  4. D \(8.4 mol kg ^{-1}\)
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Answer & Solution

Correct Answer

(A) \(10.43 mol kg ^{-1}\)

Step-by-step Solution

Detailed explanation

Mass of \(H_2SO_4 = 0.93 \times 1000 \text{ g} = 930 \text{ g}\) Moles of \(H_2SO_4 = \frac{930 \text{ g}}{98 \text{ g mol}^{-1}} = 9.4898 \text{ mol}\) Mass of solution \( = 1.84 \text{ g mL}^{-1} \times 1000 \text{ mL} = 1840 \text{ g}\) Mass of solvent…
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