Medium MCQ +4 / -1 PYQ · JEE Mains 2023

Evaluate the following statements for their correctness.

A. The elevation in boiling point temperature of water will be same for $0.1 \mathrm{M} \, \mathrm{NaCl}$ and $0.1 \mathrm{M}$ urea.

B. Azeotropic mixtures boil without change in their composition.

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

D. The density of $32 \% \, \mathrm{H}_{2} \mathrm{SO}_{4}$ solution having molarity $4.09 ~\mathrm{M}$ is approximately $1.26 \mathrm{~g} \mathrm{~mL}^{-1}$

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 :

  1. A A, B and D only
  2. B A and C only
  3. C B and D only Correct answer
  4. D B, D and E only

Solution

(A) Elevation in boiling point temperature of water will be higher for 0.1 M NaCl as compared to 0.1 M urea. <br/><br/>(B) Azeotropic mixtures boil without change in their composition <br/><br/>(C) Osmosis always takes place from hypotonic (low concentration of solute) solution to hypertonic (high concentration of solute) solution. <br/><br/>(E) When KI solution is added to AgNO<sub>3</sub> solution, positively charged solution is formed due to adsorption of Ag<sup>+</sup> ions from dispersion medium. <br/><br/>AgI/ Ag<sup>+</sup> (positively charged) <br/><br/>(D) Let the mass of H<sub>2</sub>SO<sub>4</sub> (32%) is 100. <br/><br/>$\therefore \text { Weight of } \mathrm{H}_2 \mathrm{SO}_4=32$ <br/><br/>Moles of $\mathrm{H}_2 \mathrm{SO}_4=\frac{32}{98}$ <br/><br/>Now, $4.09=\frac{32}{98 \times \mathrm{V}} \Rightarrow \mathrm{V}=79 \mathrm{ml}$ <br/><br/>Density $=\frac{100}{79}=1.265$ <br/><br/>Hence, correct answer is (C) B and D only.

About this question

Subject: Chemistry · Chapter: States of Matter · Topic: Gas Laws

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