1
JEE Main 2025 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

1.24 g of AX2 (molar mass 124 g mol−1) is dissolved in 1 kg of water to form a solution with boiling point of 100.015°C, while 25.4 g of AY2 (molar mass 250 g mol−1) in 2 kg of water constitutes a solution with a boiling point of 100.0260°C.

Kb(H2O) = 0.52 kg mol−1

Which of the following is correct?

A

AX2 and AY2 (both) are completely unionised.

B

AX2 and AY2 (both) are fully ionised.

C

AX2 is completely unionised while AY2 is fully ionised.

D

AX2 is fully ionised while AY2 is completely unionised.

2
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Assume a living cell with 0.9% (w/w) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water.
(Consider the data upto first decimal place only)

The cell will :

A
shrink since solution is $0.45 \%(\omega / \omega)$ as a result of association of glucose molecules (due to hydrogen bonding)
B
shrink since solution is $0.5 \%(\omega / \omega)$
C
show no change in volume since solution is $0.9 \%(\omega / \omega)$
D
swell up since solution is $1 \%(\omega / \omega)$
3
JEE Main 2025 (Online) 28th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass $256 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and the decrease in freezing point is 0.40 K ?

A
$4.43 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
B
$3.72 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
C
$5.12 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
D
$1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
4
JEE Main 2025 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider the given plots of vapour pressure (VP) vs temperature(T/K). Which amongst the following options is correct graphical representation showing $\Delta \mathrm{T}_{\mathrm{f}}$, depression in the freezing point of a solvent in a solution?

A
JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Solutions Question 15 English Option 1
B
JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Solutions Question 15 English Option 2
C
JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Solutions Question 15 English Option 3
D
JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Solutions Question 15 English Option 4
JEE Main Subjects
EXAM MAP