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JEE Main 28 July 2022, Shift 1, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

150 g of acetic acid was contaminated with 10.2 g ascorbic acid (

\mathrm{C_6H_8O_6}

) to lower down its freezing point by

(x\times10^{-1})^\circ

C. The value of

x

is __________. (Nearest integer) [Given

K_f=3.9\ \mathrm{K\,kg\,mol^{-1}}

; molar mass of ascorbic acid

=176\ \mathrm{g\,mol^{-1}}

]

Official answer

NTA final key (2022 Session 2).

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

Same idea in other shifts

Asked 16× in all

4 Apr 2024, Shift 2 · Q842.7 kg of each of water and acetic acid are mixed. The freezing point of the solution will be -x °C. Consider the acetic acid does not…MediumNumerical value
5 Apr 2024, Shift 2 · Q84Considering acetic acid dissociates in water, its dissociation constant is $6.25\times10^{-5}$ . If 5 mL of acetic acid is dissolved in 1…HardNumerical value
6 Apr 2024, Shift 2 · Q84When ' $x$ ' $\times 10^{-2}$ mL methanol (molar mass $= 32$ g; density $= 0.792$ g/cm $^3$ ) is added to 100 mL water (density $= 1$ …MediumNumerical valueHas a figure
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
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
3 Aug 2021, Shift 2 · Q32The lowest freezing point among the following solutions will be observed in [Atomic weight : C = 12, Mg = 24, Na = 23, Cl = 35.5, O = 16,…EasySingle correct
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.