Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET Medical202621 April 2026Morning ShiftChemistrySome Basic Concepts of ChemistryActual

Which of the following compounds has maximum number of molecules ?

Options

  1. A2 g of H ₂
  2. B7 g of N ₂
  3. C8 g of O ₂
  4. D20 g of NO ₂

Correct answer

A. 2 g of H ₂

Step-by-step solution

Number of molecules is directly proportional to the number of moles. Number of moles of H ₂ = 2 2 = 1 mol Number of moles of N ₂ = 7 28 = 0.25 mol Number of moles of O ₂ = 8 32 = 0.25 mol Number of moles of NO ₂ = 20 46 0.43 mol Since 2 g of H ₂ has the maximum number of moles, it contains the maximum number of molecules. Answer: 2 g of H ₂

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Calculate the mass of potassium chlorate required to liberate 6.72 dm ^3 of oxygen at STP. [Molar mass of potassium chlorate = 122.5 g mol ⁻¹ ] 2026Find the mass of lime obtained by heating 500 g of 90 % pure lime stone. [Molar masses Ca =40 g/mol, O =16 g/mol & C =12 g/mol] 2026A coordination complex contains 2.6 % of Mg. Find the number of Mg atoms in 5.0 g of this sample. (gram atomic mass of Mg = 24 g ) 2026Calculate the number of moles and molecules of chlorine in 4.48 dm ^3 of chlorine at STP. 2026What is the gram atomic mass of an element whose mass of one atom is 3.9853 10⁻²³ g ? 2026Calculate the total mass and number of molecules present in 3 moles of benzene. 2026Which of the following gases has high vapour density at same temperature and pressure? 2026What is the number of moles of Cl atoms present in n moles of tear gas and in n moles of mustard gas respectively? 2026 Full Some Basic Concepts of Chemistry list All MHT CET Medical PYQs