Illustration of matter states or particles.

Atoms and Molecules - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 2)

Welcome to the Atoms and Molecules Quiz! This quiz is designed for CBSE Class 9 Science students and focuses solely on the content from Chapter 3 of your science textbook. Test your understanding of fundamental concepts related to atoms, molecules, laws of chemical combination, and atomic theory. This is Set 2 of 5, containing 10 multiple-choice questions. Good luck!

1. What is the building block of all matter?

A) Molecules B) Elements C) Atoms D) Compounds

2. In which unit is atomic radius measured?

A) Metres B) Centimetres C) Nanometres D) Millimetres

3. Who suggested that the symbols of elements be made from one or two letters of the name of the element?

A) John Dalton B) Antoine L. Lavoisier C) Joseph L. Proust D) Berzilius

4. What is the symbol for the element 'Iron' derived from its Latin name 'ferrum'?

A) I B) Ir C) Fe D) Fo

5. What is the atomic mass unit 'u' defined as, according to the latest IUPAC recommendations?

A) Equal to the mass of one oxygen atom B) Equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12 C) Equal to the mass of one hydrogen atom D) Equal to the mass of one sulphur atom

6. What is the general definition of a molecule?

A) A single charged atom B) A group of two or more atoms chemically bonded together C) A large aggregate of ions D) An indivisible particle of matter

7. What is the atomicity of a molecule of phosphorus (P₄)?

A) Monoatomic B) Diatomic C) Tetra-atomic D) Poly-atomic

8. A positively charged ion is called a/an:

A) Anion B) Cation C) Polyatomic ion D) Molecule

9. What is the combining power or capacity of an element known as?

A) Atomicity B) Atomic mass C) Valency D) Molecular mass

10. What is the chemical formula of a compound, such as Ammonium?

A) NH₃⁺ B) NH₄⁺ C) NH₂⁺ D) NH₅⁺

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Atoms and Molecules Quizzes

Atoms and Molecules Set 1 Atoms and Molecules Set 2 Atoms and Molecules Set 3 Atoms and Molecules Set 4 Atoms and Molecules Set 5

Atoms and Molecules - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 2)

1. What is the building block of all matter? Read

2. In which unit is atomic radius measured? Read

3. Who suggested that the symbols of elements be made from one or two letters of the name of the element? Read

4. What is the symbol for the element 'Iron' derived from its Latin name 'ferrum'? Read

5. What is the atomic mass unit 'u' defined as, according to the latest IUPAC recommendations? Read

6. What is the general definition of a molecule? Read

7. What is the atomicity of a molecule of phosphorus (P4)? Read

8. A positively charged ion is called a/an: Read

9. What is the combining power or capacity of an element known as? Read

10. What is the chemical formula of a compound, such as Ammonium? Read