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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 29 June 2022, Shift 2, Physics Q35

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

In the following nuclear reaction, D→αD1→β−D2→αD3→γD4D \xrightarrow{\alpha} D_1 \xrightarrow{\beta^-} D_2 \xrightarrow{\alpha} D_3 \xrightarrow{\gamma} D_4 Mass number of DD is 182 and atomic number is 74. Mass number and atomic number of D4D_4 respectively will be ___
  1. (1)174 and 71Official answer
  2. (2)174 and 69
  3. (3)172 and 69
  4. (4)172 and 71

Official answer

Option 1

NTA final key.

Chapter
Nuclei
Topic
Radioactive Decay
Idea tested
Counting Alpha and Beta Emissions

Same idea in other shifts

Asked 3× in all
  1. 26 Jun 2022, Shift 1 · Q48How many alpha and beta particles are emitted when Uranium 92U238_{92}\mathrm{U}^{238} decays to lead 82Pb206_{82}\mathrm{Pb}^{206} ?EasySingle correct
  2. 4 Aug 2021, Shift 1 · Q4A hypothetical radioactive nuclei decays according to the following series…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.