1
JEE Main 2024 (Online) 27th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A solution of two miscible liquids showing negative deviation from Raoult's law will have :

A
increased vapour pressure, increased boiling point
B
increased vapour pressure, decreased boiling point
C
decreased vapour pressure, decreased boiling point
D
decreased vapour pressure, increased boiling point
2
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

What weight of glucose must be dissolved in $$100 \mathrm{~g}$$ of water to lower the vapour pressure by $$0.20 \mathrm{~mm} ~\mathrm{Hg}$$ ?

(Assume dilute solution is being formed)

Given : Vapour pressure of pure water is $$54.2 \mathrm{~mm} ~\mathrm{Hg}$$ at room temperature. Molar mass of glucose is $$180 \mathrm{~g} \mathrm{~mol}^{-1}$$

A
3.69 g
B
2.59 g
C
3.59 g
D
4.69 g
3
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
A, B and D only
B
A and C only
C
B and D only
D
B, D and E only
4
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List I List II
A. van't Hoff factor, i I. Cryoscopic constant
B. $$\mathrm{k_f}$$ II. Isotonic solutions
C. Solutions with same osmotic pressure III. $$\mathrm{\frac{Normal\,molar\,mass}{Abnormal\,molar\,mass}}$$
D. Azeotropes IV. Solutions with same composition of vapour above it

Choose the correct answer from the options given below :

A
A-III, B-I, C-IV, D-II
B
A-III, B-I, C-II, D-IV
C
A-III, B-II, C-I, D-IV
D
A-I, B-III, C-II, D-IV
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