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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceMatch the listMediumRecall

JEE Main 24 February 2021, Shift 2, Chemistry Q37

Question 37 of 90 in this shift, Chemistry question 7 of 30, Section A.

Match List - I with List - II. List - I (Salt) | List - II (Flame colour wavelength) (a) LiCl | (i) 455.5 nm (b) NaCl | (ii) 670.8 nm (c) RbCl | (iii) 780.0 nm (d) CsCl | (iv) 589.2 nm Choose the correct answer from the options given below :
  1. (1)(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
  2. (2)(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)Official answer
  3. (3)(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
  4. (4)(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 7× in all
  1. 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
  2. 30 Jan 2024, Shift 2 · Q90Number of metal ions characterized by flame test among the following is ________.…MediumNumerical value
  3. 15 Apr 2023, Shift 1 · Q67Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R : Assertion (A) : BeCl2\mathrm{BeCl_2}…EasyAssertion–reason
  4. 26 Jun 2022, Shift 2 · Q66s-block element which **cannot** be qualitatively confirmed by the flame test isEasySingle correct
  5. 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
  6. 4 Aug 2021, Shift 1 · Q50Match List I with List II List I (Metal salt) List II (Colour to the flame) A. Cu2+\mathrm{Cu^{2+}} I. Brick Red B. Sr2+\mathrm{Sr^{2+}} II.…EasyMatch 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.