Evaluate the following statements for their correctness. 
A) The elevation in boiling point temperature of water will be same for 0.1M NaCl and 0.1M urea. 
B) Azeotropic mixtures boil without change in their composition. 
C) Osmosis always takes place from hypertonic to hypotonic solution. 
D) The density of 32% H₂SO₄ solution having molarity 4.09M is approximately 1 1.26 g mL^-1. 
E) A negatively charged sol is obtained when KI solution is added to silver nitrate solution. 
Choose the correct answer from the options given below:

Explanation

A) The elevation in boiling point temperature of water will be the same for 0.1M NaCl and 0.1M urea.

Incorrect: Boiling point elevation depends on the number of particles in solution. NaCl, an electrolyte, dissociates into two ions (Na⁺ and Cl⁻), effectively doubling the particle concentration compared to urea, a nonelectrolyte that doesn't dissociate. Therefore, 0.1M NaCl will cause a greater elevation in boiling point than 0.1M urea.

B) Azeotropic mixtures boil without change in their composition.

Correct: An azeotropic mixture has a constant boiling point, and its vapor has the same composition as the liquid phase. This means that during boiling, the composition remains unchanged.

C) Osmosis always takes place from hypertonic to hypotonic solution.

Incorrect: Osmosis is the movement of water across a semipermeable membrane from a region of lower solute concentration (hypotonic) to higher solute concentration (hypertonic) until equilibrium is reached. Therefore, it occurs from hypotonic to hypertonic solutions.

D) The density of 32% H₂SO₄ solution having molarity 4.09M is approximately 1.26 g/mL.

Correct: Calculations show that a 32% sulfuric acid solution with a molarity of 4.09M has a density close to 1.26 g/mL.

E) A negatively charged sol is obtained when KI solution is added to silver nitrate solution.

InCorrect: When KI is added to AgNO₃, AgI precipitates, and iodide ions (I⁻) are adsorbed onto the AgI particles, forming a negatively charged sol.

Final Answer

The correct statements are B, D