JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 8 January 2020, Shift 1, Chemistry Q28

Question 28 of 75 in this shift, Chemistry question 3 of 25, Section A.

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :

(1) $\mathrm{K_3[Fe(CN)_6] > AlCl_3 > K_2CrO_4 > KBr > KNO_3}$
(2) $\mathrm{AlCl_3 > K_3[Fe(CN)_6] > K_2CrO_4 > KBr = KNO_3}$
(3) $\mathrm{K_3[Fe(CN)_6] < K_2CrO_4 < AlCl_3 < KBr < KNO_3}$
(4) $\mathrm{K_3[Fe(CN)_6] < K_2CrO_4 < KBr = KNO_3 = AlCl_3}$ Official answer

Official answer

Option 4

NTA final key (Jan 2020).

Chapter: Surface Chemistry
Topic: Colloids
Idea tested: Hardy-Schulze Rule

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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 42 of the 174 JEE Main shifts held from 2017 to 2026.