Illustration of matter states or particles.

Atoms and Molecules - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 3)

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 3 of 5, containing 10 multiple-choice questions. Good luck!

1. What does 'mole' (mol) represent in chemistry?

A) A unit of mass B) A unit of volume C) The amount of substance containing Avogadro number of particles D) A unit of temperature

2. What is the value of Avogadro's number?

A) 6.022 x 10²² particles/mol B) 6.022 x 10²³ particles/mol C) 6.022 x 10²⁴ particles/mol D) 6.022 x 10²⁵ particles/mol

3. How is the gram atomic mass of an element defined?

A) The mass of one atom of that element in grams B) The mass of one mole of atoms of that element in grams C) The mass of 12 atoms of carbon-12 D) The mass of a single proton

4. What is the relationship between the molecular mass of a substance and its molar mass?

A) Molecular mass is expressed in 'u', molar mass in 'g' B) Molecular mass is the mass of a single molecule, molar mass is the mass of one mole of molecules C) Both A and B D) There is no relationship

5. Calculate the molecular mass of nitric acid (HNO₃) given atomic masses: H=1u, N=14u, O=16u.

A) 61 u B) 62 u C) 63 u D) 64 u

6. What is the formula unit mass for Sodium Chloride (NaCl) given atomic masses: Na=23u, Cl=35.5u?

A) 57.5 u B) 58.5 u C) 59.5 u D) 60.5 u

7. How many moles are present in 22g of CO₂? (Molar mass of CO₂ = 44 g/mol)

A) 0.25 mol B) 0.5 mol C) 1 mol D) 2 mol

8. What is the mass of 0.5 mole of N₂ gas? (Atomic mass of N = 14u)

A) 7 g B) 14 g C) 28 g D) 56 g

9. How many molecules are present in 18g of water (H₂O)? (Molar mass of H₂O = 18 g/mol, Avogadro's number = 6.022 x 10²³)

A) 6.022 x 10²² molecules B) 6.022 x 10²³ molecules C) 1.2044 x 10²⁴ molecules D) 18 molecules

10. What is the general term for a group of atoms carrying a net charge?

A) Molecule B) Element C) Ion D) Compound

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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 3)

1. What does 'mole' (mol) represent in chemistry? Read

2. What is the value of Avogadro's number? Read

3. How is the gram atomic mass of an element defined? Read

4. What is the relationship between the molecular mass of a substance and its molar mass? Read

5. Calculate the molecular mass of nitric acid (HNO3) given atomic masses: H=1u, N=14u, O=16u. Read

6. What is the formula unit mass for Sodium Chloride (NaCl) given atomic masses: Na=23u, Cl=35.5u? Read

7. How many moles are present in 22g of CO2? (Molar mass of CO2 = 44 g/mol) Read

8. What is the mass of 0.5 mole of N2 gas? (Atomic mass of N = 14u) Read

9. How many molecules are present in 18g of water (H2O)? (Molar mass of H2O = 18 g/mol, Avogadro's number = 6.022 x 1023) Read

10. What is the general term for a group of atoms carrying a net charge? Read