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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceOtherMediumRecall

JEE Main 9 January 2020, Shift 2, Chemistry Q34

Question 34 of 75 in this shift, Chemistry question 9 of 25, Section A.

Among the statements (a)-(d), the correct ones are : (a) Lithium has the highest hydration enthalpy among the alkali metals. (b) Lithium chloride is insoluble in pyridine. (c) Lithium cannot form ethynide upon its reaction with ethyne. (d) Both lithium and magnesium react slowly with H2O\mathrm{H_2O}.
  1. (1)(a) and (d) only
  2. (2)(b) and (c) only
  3. (3)(a), (c) and (d) onlyOfficial answer
  4. (4)(a), (b) and (d) only

Official answer

Option 3

NTA final key (Jan 2020).

Chapter
The s-Block Elements
Topic
s-Block Elements
Idea tested
Diagonal Relationship

Same idea in other shifts

Asked 2× in all
  1. 2 Apr 2017 (offline) · Q41Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is :MediumSingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.