CBSE - Class 9th - Science - Ch 3 - Atoms and Molecules - Question Bank

Hi Friends, Hope you liked my previous question bank on Chapter 2 - Is Matter around Us Pure. In this post I would like to share a set of Questions from Chapter 3 - Atoms and Molecules.

CBSE - Class 9th - Science Book

Chapter 3 - Atoms and Molecules

• What are the 2 Laws of Chemical combination as established by Lavoisier and Proust? Explain each of them.

• What is an Atom?

• State the Postulates of Dalton’s Atomic Theory.

• What is IUPAC?

• What is the atomic Symbol of 
• Gold
• Iron
• Lead
• Potassium
• Silver

• Define Relative atomic mass of the atom of an element.

• What is the atomic mass of 
• Carbon
• Oxygen
• Chlorine

• What is a Molecule?

• What is Atomicity? What is the atomicity of 
• Oxygen
• Phosphorus
• Sulphur

• What is a compound? Give 2 examples with its constituents.

• What is an Ion? 

• What are the 2 types of Ions? 

• Give few examples of Ionic Compounds.

• What is Valency?

• Name few elements which show more than One Valency.

• Derive the formulae of below compounds with diagram depicting valency exchange:
• Hydrogen Sulphide
• Calcium Oxide
• Sodium Nitrate
• Calcium Hydroxide

• What is the difference between Molecular Mass and Formula Unit Mass? Give Example and explain.

• Define One Mole. What is the number of particles present in 1 mole of any substance?

I would request you to work on the Important numerical involving Molecular Mass, Mole, etc to stay more prepared for exams.

Would you like to have solutions for the above questions? Let me know your thoughts by commenting below.

All the Best for Exams!