JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 27 July 2022, Shift 2, Chemistry Q80

Question 80 of 90 in this shift, Chemistry question 20 of 30, Section A.

\mathrm{Fe^{3+}}

cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of :

(1) $\mathrm{[Fe(H_2O)_6]_2\ [Fe(CN)_6]}$
(2) $\mathrm{Fe_2[Fe(CN)_6]_2}$
(3) $\mathrm{Fe_3[Fe(OH)_2\ (CN)_4]_2}$
(4) $\mathrm{Fe_4[Fe(CN)_6]_3}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: The d- and f-Block Elements
Topic: Cation Analysis
Idea tested: Confirmatory Tests

Same idea in other shifts

Asked 4× in all

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3 Aug 2021, Shift 2 · Q48Match List I with II List I | List II (Ion detected) A. Borax Bead test | I. $\mathrm{As^{3+}}$ B. Charcoal cavity test | II.…MediumMatch the list

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.