JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumRecall

JEE Main 30 January 2024, Shift 2, Chemistry Q90

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

Number of metal ions characterized by flame test among the following is ________.

\mathrm{Sr^{2+}, Ba^{2+}, Ca^{2+}, Cu^{2+}, Zn^{2+}, Co^{2+}, Fe^{2+}}

Official answer

NTA final key.

Chapter: The s-Block Elements
Topic: s-Block Elements
Idea tested: Flame Coloration

Same idea in other shifts

Asked 3× in all

6 Apr 2024, Shift 2 · Q66Match List - I with List - II. List - I (Alkali Metal) (A) Li (B) Na (C) Rb (D) Cs List - II (Emission Wavelength in nm) (I) 589.2 (II)…HardMatch the list
29 Jun 2022, Shift 1 · Q69Match List - I with List - II. List - I (Metal) (A) Li (B) Na (C) Rb (D) Cs List - II (Emitted light wavelength (nm)) (I) 670.8 (II) 589.2…HardMatch 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 42 of the 174 JEE Main shifts held from 2017 to 2026.