JEE Main · 2023 · 31 Jan 2023 · Shift 2 · Solutions

Taking the statements in turn: the boiling-point elevation depends on the van't Hoff factor, and sodium chloride with $i=2$ raises the boiling point more than urea with $i=1$ at the same molarity, so the first is false. An azeotrope distils with its composition unchanged, so the second is true. In osmosis the solvent moves from the dilute, hypotonic side to the concentrated, hypertonic side, not the other way, so the third is false. For the sulphuric acid solution, $d=\frac{M\times M_{wt}}{\%\times 10}=\frac{4.09\times 98}{32\times 10}\approx 1.26\mathrm{g}\mathrm{m}{\mathrm{L}}^{-1}$, so the fourth is true. Adding potassium iodide to excess silver nitrate adsorbs silver ions and gives a positively charged sol, so the fifth is false. Only statements B and D are correct.