JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Solutions

WhatsApp Email

2 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is :
(Given : Ebullioscopic constant of water

= 0.52 K kg mol^{- 1}

)

(A)379.2 K
(B)377.3 K✓ Correct
(C)375.3 K
(D)277.3 K

Answer: (B)

Solution

Ethylene glycol and glucose are both non-electrolytes, each with van't Hoff factor

i = 1

. The total solute is

2 + 2 = 4

mol in

0.5

kg of water, a molality of

m = \frac{4}{0.5} = 8 mol kg^{- 1}

. The elevation is

Δ T_{b} = K_{b} m = 0.52 \times 8 = 4.16

K. Added to the normal boiling point of water,

373.15 + 4.16 = 377.31

K, the solution boils at

377.3

JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Solutions →

More JEE Main questions on Solutions

Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and $PQ_{2}$ . When 1 g of PQ is dissolved in 50 g of solvent 'A', $Δ T_{b}$ was 1.176 K while when 1 g of $PQ_{2}$ is dissolved in 50 g of solvent 'A', …
JEE Main 2026View solution →
Consider a solution of $CO_{2} (g)$ dissolved in water in a closed container.

Which one of the following plots correctly represents variation of log (partial pressure of CO2 in vapour phase above water) [y-axis] with log (mole fraction of $CO_{2}$ …
JEE Main 2026View solution →
Given below are two statements:

Statement I: The Henry's law constant $K_{H}$ is constant with respect to variations in solution's concentration over the range for which the solutions is ideally dilute.
Statement II : $K_{H}$ does not diff …
JEE Main 2026View solution →
The osmotic pressure of a living cell is 12 atm at 300 K. The strength of sodium chloride solution that is isotonic with the living cell at this temperature is $____$ $g L^{- 1}$ . (Nearest integer)

Given: …
JEE Main 2026View solution →
A substance 'X' (1.5 g) dissolved in 150 g of a solvent 'Y' (molar mass $= 300 g mol^{- 1}$ ) led to an elevation of the boiling point by 0.5 K. The relative lowering in the vapour pressure of the solvent 'Y' is $____$ $\times 1 0^{- 2}$ . (Nearest integer)
[Giv …
JEE Main 2026View solution →
Which one of the following graphs accurately represents the plot of partial pressure of $CS_{2}$ vs its mole fraction in a mixture of acetone and $CS_{2}$ at constant temperature ?
JEE Main 2026View solution →