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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 8 January 2020, Shift 2, Chemistry Q34

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

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x)(x), (y)(y) and (z)(z), the sum of (x)(x), (y)(y) and (z)(z) is :
  1. (1)1
  2. (2)2
  3. (3)3Official answer
  4. (4)4

Official answer

Option 3

NTA final key (Jan 2020).

Chapter
Hydrogen
Topic
Hydrogen and Hydrides
Idea tested
Isotopes of Hydrogen

Same idea in other shifts

Asked 5× in all
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  4. 27 Aug 2021, Shift 1 · Q37Deuterium resembles hydrogen in properties but :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.