Class 9 Chemistry Chapter 4: Stoichiometry Practice MCQs with Answers

Stoichiometry is one of the most important chapters in Chemistry. It focuses on the quantitative relationships between reactants and products in chemical reactions. Understanding stoichiometry helps students solve problems related to the amount of substances, their mass, and moles in reactions. This chapter includes key topics such as Chemical Formula, Empirical Formula, Avogadro’s Number (Na), The Mole, and Molar Mass.

These notes are designed according to the 2026 new syllabus and will help you understand the concepts in a simple and clear way. They are perfect for exam preparation, homework, or revision.

MCQs – Class 9 Chemistry Chapter 4 Stoichiometry 

1. How many atoms are present in one gram of H₂O?

(a) 1002 × 10²³ atoms
(b) 6.022 × 10²³ atoms
(c) 0.334 × 10²³ atoms
(d) 2.004 × 10²³ atoms
Answer: (a) 1.002 × 10²³ atoms

2. Which of the following elements exists as a molecule in nature?

(a) Na
(b) Fe
(c) O₂
(d) Ca

✅ Answer: (c) O₂

3. Which of the following is a covalent compound?

(a) NaCl → Ionic compound (metal + non-metal) 
(b) KBr → Ionic compound (metal + non-metal) 
(c) HCl → Covalent compound (non-metal + non-metal) 
(d) CaCl₂ → Ionic compound (metal + non-metal) 

✅ Answer: (c) HCl

4. What is the correct chemical formula of lithium oxide?

(a) LiO 
(b) LiO₂ 
(c) Li₂O 
(d) Li₃O₂ 

✅ Answer: (c) Li₂O

5. The molar mass of hydrogen atoms is:

(a) 1.008 g 
(b) 2.016 g
(c) 16.00 g
(d) 1.000 g

✅ Answer: (a) 1.008 g

6. Which of the following must a chemical equation always follow?

(a) Law of inertia 
(b) Law of multiple proportions 
(c) Law of conservation of mass 
(d) Law of gravity 

✅ Answer: (c) Law of conservation of mass

Main Topics Covered:

1. Chemical Formula – Learn how chemical formulas represent elements and compounds.

2. Empirical Formula – Understand the simplest ratio of elements in a compound.

3. Avogadro’s Number (Na) – Study the number of particles in one mole of a substance.

4. The Mole – Explore the concept of mole and its significance in chemistry.

5. Molar Mass – Calculate the mass of one mole of a substance for solving stoichiometric problems.

These notes include examples and clear explanations to make learning easier and faster.

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Get your Class 9 Chemistry Chapter 4 Stoichiometry MCQs for the 2026 syllabus with easy-to-understand questions and answers.

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✔ Clear and simple language
✔ Designed for exams
✔ Perfect for quick practice and revision

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