Evaluate the following statements for their correctness. A. The elevation in boiling point temperature of water will be…

Strategy:\n> Evaluate chemical statements by applying colligative property laws, concentration conversions, and definitions of solution types.\n\nEvaluation:\n- A. $\ce{NaCl}$ ($i=2$) vs Urea ($i=1$). At same $M$, $\ce{NaCl}$ gives double the particles, so elevations differ. Incorrect.\n- B. Azeotropes have identical composition in liquid and vapour, so they boil at a constant temperature without changing composition. Correct.\n- C. Osmosis is solvent movement from low solute (Hypotonic) to high solute (Hypertonic). Incorrect.\n- D. Relation: $M = \\frac{10 \\times \% \\times \rho}{M_r}$. Let's verify: $4.09 = \\frac{10 \\times 32 \\times 1.26}{98} \implies \\frac{403.2}{98} \approx 4.11$. It is \approximately correct. Correct.\n- E. When $\ce{KI}$ is added to excess $\ce{AgNO3}$, $\ce{AgI}$ absorbs $\ce{Ag+}$ ions to form a positive sol. Incorrect.\n\nBased on the options, B and D are the correct ones.\n\n$\boxed{\\text{Answer: (1)}}$