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JEE Main 26 June 2022, Shift 1, Chemistry Q82

Question 82 of 90 in this shift, Chemistry question 22 of 30, Section B.

A 0.5 percent solution of potassium chloride was found to freeze at

-0.24

°C. The percentage dissociation of potassium chloride is __________. (Nearest integer) (Molal depression constant for water is 1.80 K kg mol

^{-1}

and molar mass of KCl is 74.6 g mol

^{-1}

)

Official answer

NTA final key.

Chapter: Solutions
Topic: Colligative Properties
Idea tested: Degree of Dissociation from Van't Hoff Factor

Same idea in other shifts

Asked 6× in all

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10 Apr 2023, Shift 1 · Q84If the degree of dissociation of aqueous solution of weak monobasic acid is determined to be 0.3, then the observed freezing point will be…MediumNumerical value
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17 Mar 2021, Shift 2 · Q54A 1 molal $\mathrm{K_4Fe(CN)_6}$ solution has a degree of dissociation of 0.4. Its boiling point is equal to that of another solution…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.