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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 4 April 2024, Shift 1, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :
  1. (1)decrease concentration of −OH\mathrm{^-OH} ionsOfficial answer
  2. (2)prevent interference by phosphate ions
  3. (3)increase concentration of Cl−\mathrm{Cl^-} ions
  4. (4)increase concentration of NH4+\mathrm{NH_4^+} ions

Official answer

Option 1

NTA final key.

Chapter
Coordination Compounds
Topic
Cation Analysis
Idea tested
Group III Hydroxides

Same idea in other shifts

Asked 2× in all
  1. 27 Aug 2021, Shift 2 · Q50The addition of dilute NaOH to Cr3+\mathrm{Cr^{3+}} salt solution will give :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.