JEE Main 2023 — Chemistry Physical Chemistry

2023mcqeasy

Evaluate the following statements for their correctness.

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

B. Azeotropic mixture boil without change in their composition.

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

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

E. A negatively charged sol is obtained when $\mathrm{KI}$ solution is added to silver nitrate solution.

Choose the correct answer from the options given below:

Official previous-year question

Held on 31 Jan 2023 · Verified 6 Jul 2026.

Options

A
B and D only
B
B, D and E only
C
A and C only
D
A, B and C only

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Solution

(A) Elevation in boiling point ( $\Delta {T}_{b}$ ) temperature of the water is not same, as ‘ $i$ ’ value is different for two solutions.

(B) Azeotropic mixture: Liquid mixtures that distill over without changes in composition are called constant boiling mixtures or Azeotropes or Azeotropic mixtures.

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

(D) Let the mass of ${H}_{2}{\mathrm{SO}}_{4}$ ( $32%$ ) is 100.

$\therefore$ Weight of ${H}_{2}{\mathrm{SO}}_{4}$ = $32$

Moles of ${H}_{2}{\mathrm{SO}}_{4}=\frac{32}{98}$

Now, $4.09=\frac{32}{98\times V}$

$\Rightarrow V=79\mathrm{mL}$

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

(E) A negative charged sol is obtained when $\mathrm{KI}$ solution is added to silver nitrate solution whereas positive charged sol is obtained when ${\mathrm{AgNO}}_{3}$ solution is added to $\mathrm{KI}$ solution.

So, the correct answer is B and D only.

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Solution

(A) Elevation in boiling point ( $\Delta {T}_{b}$ ) temperature of the water is not same, as ‘ $i$ ’ value is different for two solutions.

(B) Azeotropic mixture: Liquid mixtures that distill over without changes in composition are called constant boiling mixtures or Azeotropes or Azeotropic mixtures.

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

(D) Let the mass of ${H}_{2}{\mathrm{SO}}_{4}$ ( $32%$ ) is 100.

$\therefore$ Weight of ${H}_{2}{\mathrm{SO}}_{4}$ = $32$

Moles of ${H}_{2}{\mathrm{SO}}_{4}=\frac{32}{98}$

Now, $4.09=\frac{32}{98\times V}$

$\Rightarrow V=79\mathrm{mL}$

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

So, the correct answer is B and D only.

JEE Main 2023 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

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JEE Main 2023 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry