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Saturday, 10 October

JEE Main 2026 · ChemistryMultiple choiceMatch the listEasyCalculation

JEE Main 8 April 2026, Shift 2, Chemistry Q51

Question 51 of 75 in this shift, Chemistry question 1 of 25, Section A.

Match List - I with List - II. List - I (Mass of substance) | List - II (Number of atoms) A. 1.8 mg water | I. 2×10−4×NA2 \times 10^{-4} \times \mathrm{N_A} B. 9.8 mg sulphuric acid | II. 1.5×10−4×NA1.5 \times 10^{-4} \times \mathrm{N_A} C. 1.8 mg carbon | III. 3×10−4×NA3 \times 10^{-4} \times \mathrm{N_A} D. 5.85 mg salt (NaCl) | IV. 7×10−4×NA7 \times 10^{-4} \times \mathrm{N_A} Choose the correct answer from the options given below :
  1. (1)A-IV, B-III, C-I, D-II
  2. (2)A-III, B-II, C-IV, D-I
  3. (3)A-III, B-IV, C-II, D-IOfficial answer
  4. (4)A-III, B-IV, C-I, D-II

Official answer

Option 3

NTA final key.

Chapter
Some Basic Concepts of Chemistry
Topic
Mole Concept
Idea tested
Mole and Avogadro Calculations

Same idea in other shifts

Asked 5× in all
  1. 4 Apr 2026, Shift 2 · Q51The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP is:EasySingle correct
  2. 6 Apr 2026, Shift 2 · Q51Which of the following contain the same number of atoms ? (Given : Molar mass in g mol−1^{-1} of H, He, O and S are 1, 4, 16 and 32…EasyOther
  3. 3 Apr 2025, Shift 1 · Q51Among 10−910^{-9} g (each) of the following elements, which one will have the highest number of atoms? Element: Pb, Po, Pr and PtEasySingle correct
  4. 18 Mar 2021, Shift 1 · Q51Complete combustion of 3 g of ethane gives x×1022x\times10^{22} molecules of water. The value of xx is __________. (Round off to the Nearest…EasyNumerical value

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.