JEE Main 2023 — Solutions Question with Solution

(A) Elevation in boiling point temperature of water will be higher for 0.1 M NaCl as compared to 0.1 M urea.

(B) Azeotropic mixtures boil without change in their composition

(C) Osmosis always takes place from hypotonic (low concentration of solute) solution to hypertonic (high concentration of solute) solution.

(E) When KI solution is added to AgNO₃ solution, positively charged solution is formed due to adsorption of Ag⁺ ions from dispersion medium.

AgI/ Ag⁺ (positively charged)

(D) Let the mass of H₂SO₄ (32%) is 100.

$$\therefore \text{ Weight of }{\mathrm{H}}_2{\mathrm{SO}}_4=32$$

Moles of ${\mathrm{H}}_2{\mathrm{SO}}_4=\frac{32}{98}$

Now, $4.09=\frac{32}{98\times \mathrm{V}}\Rightarrow \mathrm{V}=79\mathrm{ml}$

Density $=\frac{100}{79}=1.265$

Hence, correct answer is (C) B and D only.