Learn

Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceOtherEasyCalculation

JEE Main 6 April 2026, Shift 2, Chemistry Q51

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

Which 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 respectively) A. 2 g of O2\mathrm{O_2} gas B. 4 g of SO2\mathrm{SO_2} gas C. 1400 mL of O2\mathrm{O_2} at STP D. 0.05 L of He at STP E. 0.0625 mol of H2\mathrm{H_2} gas Choose the correct answer from the options given below :
  1. (1)A and B only
  2. (2)B and C only
  3. (3)C and D only
  4. (4)A, C and E onlyOfficial answer

Official answer

Option 4

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. 8 Apr 2026, Shift 2 · Q51Match List - I with List - II. List - I (Mass of substance) | List - II (Number of atoms) A. 1.8 mg water | I.…EasyMatch the list
  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.