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JEE Main Chemistry Some Basic Concepts of Chemistry 2026 JEE Main 2026 (04 April Shift 2)

JEE Main Chemistry Question (2026) — Solution

Question

The 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:

Options

  1. A. C>A>B
  2. B. C>B>A
  3. C. B>C>A
  4. D. B>A>C

Answer

D. B>A>C

Step-by-step solution

For (A): Formula of cyclohexane is C_6H_ 12 . Number of atoms per molecule = 6 + 12 = 18. Total number of atoms in 2 moles = 2 18 N_A = 36 N_A. For (B): Formula of sucrose is C_ 12 H_ 22 O_ 11 . Molar mass of sucrose = 342 g/mol. Number of moles = 684 342 = 2 moles. Number of atoms per molecule = 12 + 22 + 11 = 45. Total number of atoms = 2 45 N_A = 90 N_A. For (C): Formula of dihydrogen is H_2. Number of moles at STP = 90.8 22.7 = 4 moles. Number of atoms per molecule = 2. Total number of atoms = 4 2 N_A = 8 N_A. Comparing the total number of atoms: 90 N_A > 36 N_A > 8 N_A Therefore, the correct order is B > A > C. Answer: B>A>C

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