JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 3 August 2021, Shift 2, Chemistry Q32

Question 32 of 90 in this shift, Chemistry question 2 of 30, Section A.

The lowest freezing point among the following solutions will be observed in [Atomic weight : C = 12, Mg = 24, Na = 23, Cl = 35.5, O = 16, N = 14]

(1)5.85g of NaCl in 500 mL water
(2)6g urea in 500 mL water
(3)18g of glucose in 500 mL water
(4)9.5g of $\mathrm{MgCl_2}$ in 500 mL waterOfficial answer

Official answer

Option 4

NTA final key.

Chapter: Solutions
Topic: Colligative Properties
Idea tested: Freezing Point Depression

Same idea in other shifts

Asked 16× in all

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30 Jan 2024, Shift 1 · Q63What happens to freezing point of benzene when small quantity of napthalene is added to benzene ?EasySingle correct
25 Jul 2022, Shift 2 · Q62Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of…EasySingle correct
28 Jul 2022, Shift 1 · Q84150 g of acetic acid was contaminated with 10.2 g ascorbic acid ( $\mathrm{C_6H_8O_6}$ ) to lower down its freezing point by…EasyNumerical value
30 Jul 2022, Shift 2 · Q5331 g of ethylene glycol is mixed with 500 g of water. The freezing point of the aqueous solution is ________ K. (in nearest integer)…EasyNumerical value
26 Aug 2021, Shift 2 · Q5483 g of ethylene glycol dissolved in 625 g of water. The freezing point of the solution is __________ K. (Nearest integer) [Use : Molal…MediumNumerical value

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.