JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 9 January 2020, Shift 1, Chemistry Q47

Question 47 of 75 in this shift, Chemistry question 22 of 25, Section B.

How much amount of NaCl should be added to 600 g of water (

\rho = 1.00

g/mL) to decrease the freezing point of water to

-0.2^\circ\mathrm{C}

? ________. (The freezing point depression constant for water

= 2\ \mathrm{K\ kg\ mol^{-1}}

)

Official answer

1.74 to 1.76; 0.03 to 0.03

NTA final key (Jan 2020): multiple answers accepted. Any value in the range scored.

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
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

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.