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1
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
$\mathrm{HA}(a q) \rightleftharpoons \mathrm{H}^{+}(a q)+\mathrm{A}^{-}(a q)$

The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20 °C. The dissociation constant for the acid is

Given: $K_f$(H2O) = 1.8 K kg mol−1, molality ≡ molarity

A

$1.90 \times 10^{-3}$

B

$1.38 \times 10^{-3}$

C

$1.1 \times 10^{-2}$

D

$1.89 \times 10^{-1}$

2
JEE Main 2025 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

A

$\text{CH}_3\text{OH} + \text{CHCl}_3$

B

$\text{C}_6\text{H}_5\text{OH} + \text{C}_6\text{H}_5\text{NH}_2$

C

$\text{H}_2\text{O} + \text{CH}_3\text{COC}_2\text{H}_5$

D

$\text{CS}_2 + \text{CH}_3\text{COCH}_3$

3
JEE Main 2025 (Online) 7th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

Liquid A and B form an ideal solution. The vapour pressures of pure liquids A and B are 350 and 750 mm Hg respectively at the same temperature. If $x_A$ and $x_B$ are the mole fraction of A and B in solution while $y_A$ and $y_B$ are the mole fraction of A and B in vapour phase, then,

A

$(x_A - y_A) < (x_B - y_B)$

B

$\frac{x_A}{x_B} = \frac{y_A}{y_B}$

C

$\frac{x_A}{x_B} < \frac{y_A}{y_B}$

D

$\frac{x_A}{x_B} > \frac{y_A}{y_B}$

4
JEE Main 2025 (Online) 7th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

Match List - I with List - II.

List - I List - II
(A) Solution of chloroform and acetone (I) Minimum boiling azeotrope
(B) Solution of ethanol and water (II) Dimerizes
(C) Solution of benzene and toluene (III) Maximum boiling azeotrope
(D) Solution of acetic acid in benzene (IV) ΔVmix = 0

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

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