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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 31 August 2021, Shift 1, Chemistry Q35

Question 35 of 90 in this shift, Chemistry question 5 of 30, Section A.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period. Reason (R) : It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are correct and (R) is the correct explanation of (A).
  2. (2)Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  3. (3)(A) is true but (R) is false.Official answer
  4. (4)(A) is false but (R) is true.

Official answer

Option 3

NTA final key.

Chapter
Classification of Elements and Periodicity in Properties
Topic
Periodic Trends
Idea tested
Metallic and Non-Metallic Character Trends

Same idea in other shifts

Asked 4× in all
  1. 10 Apr 2023, Shift 2 · Q64The correct order of metallic character is =EasySingle correct
  2. 28 Jul 2022, Shift 2 · Q32The correct decreasing order for metallic character isEasySingle correct
  3. 16 Mar 2021, Shift 2 · Q33The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :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 108 of the 174 JEE Main shifts held from 2017 to 2026.