JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2021, Shift 2, Chemistry Q55

Question 55 of 90 in this shift, Chemistry question 25 of 30, Section B.

When 3.00 g of a substance 'X' is dissolved in 100 g of

\mathrm{CCl_4}

, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is ________

\mathrm{g\ mol^{-1}}

. (Nearest integer) [Given

\mathrm{K_b}

for

\mathrm{CCl_4}

is 5.0 K kg

\mathrm{mol^{-1}}

]

Official answer

250

NTA final key.

Chapter: Solutions
Topic: Colligative Properties
Idea tested: Boiling Point Elevation

Same idea in other shifts

Asked 13× in all

4 Apr 2026, Shift 1 · Q75A non-volatile, non-electrolyte solid solute when dissolved in $40$ g of a solvent, the vapour pressure of the solvent decreased from…MediumNumerical value
8 Apr 2026, Shift 2 · Q54Which of the following statements are not correct ? A. For water, magnitude of $\mathrm{K_b}$ is more than the magnitude of…MediumOtherHas a figure
2 Apr 2025, Shift 2 · Q73When 1 g each of compounds AB and $\mathrm{AB_2}$ are dissolved in 15 g of water separately, they increased the boiling point of water by…MediumNumerical value
3 Apr 2025, Shift 1 · Q542 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is: (Given :…EasySingle correct
4 Apr 2024, Shift 1 · Q842.5 g of a non-volatile, non-electrolyte is dissolved in 100 g of water at 25°C. The solution showed a boiling point elevation by 2°C.…MediumNumerical value
13 Apr 2023, Shift 2 · Q84Sea water contains 29.25% NaCl and 19% $\mathrm{MgCl_2}$ by weight of solution. The normal boiling point of the sea water is ______…MediumNumerical value
26 Jul 2022, Shift 2 · Q84The elevation in boiling point for 1 molal solution of non-volatile solute A is 3 K. The depression in freezing point for 2 molal solution…EasyNumerical value
27 Jul 2022, Shift 1 · Q65Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.