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Saturday, 31 October

JEE Main · Chemistry · Organic Chemistry: Some Basic Principles and Techniques

Cyanide Prussian Blue Test

JEE Main asked Cyanide Prussian Blue Test 2 times in 2 of the 108 shifts Lumi analysed, in 2021 and 2024. It belongs to Anion Analysis, in Organic Chemistry: Some Basic Principles and Techniques (Chemistry). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2021
last in 2024
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200.03’210’220’230.05’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20241 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Match the list is the usual form. Skill tested: recall.

  • Identify products of a named test
  • Match list on compounds and colours

Difficulty

Easy 0Medium 2Hard 0

Every question was multiple choice.

Every question

All 2 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 8 Apr 2024, Shift 1 · Q73Match List I with List II LIST I (Compound): A. Fe4[Fe(CN)6]3⋅xH2O\mathrm{Fe_4[Fe(CN)_6]_3\cdot xH_2O}; B. [Fe(CN)5NOS]4−[\mathrm{Fe(CN)_5NOS}]^{4-}; C.…MediumMatch the list
  2. 3 Aug 2021, Shift 2 · Q42In the detection of nitrogen in an organic compound by Lassaigne's test, the iron compounds formed areMediumSingle correct

Shifts: 3 Aug 2021, Shift 2, 8 Apr 2024, Shift 1.

Same topic

Other ideas in Anion Analysis

Anion Analysis has 13 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas