Question Paper
Class / Subject: Class 8 (ICSE) · Science
Chapter: Chapter 13 — Chapter 13: Language of Chemistry
Time Allowed: 32 minutes
Max Marks: 16
1. What does a chemical formula show? [1]
(A) Elements and their ratio in a compound
(B) Only the compound's name
(C) Only its colour
(D) Nothing useful
2. What does CO2 represent? [1]
(A) One carbon and two oxygen atoms
(B) Two carbon and one oxygen atom
(C) Only carbon
(D) Only oxygen
3. What is a balanced equation? [1]
(A) One with equal atoms on both sides
(B) One with unequal atoms
(C) One with no atoms
(D) One with only reactants
4. What law does balancing follow? [1]
(A) Conservation of mass
(B) Conservation of energy only
(C) No specific law
(D) Random assignment
5. How many hydrogen atoms are in 2H2 + O2 → 2H2O? [1]
(A) 4 on each side
(B) 2 on each side
(C) 8 on each side
(D) 1 on each side
6. Why balance chemical equations? [1]
(A) To follow the conservation of mass
(B) To make equations longer
(C) No reason
(D) It's optional
7. Why is chemical language useful? [1]
(A) It enables precise global communication
(B) No reason
(C) It's not useful
(D) Only for tests
8. What does a chemical equation show? [1]
(A) Reactants forming products
(B) Only reactants
(C) Only products
(D) Neither
9. What does a chemical formula show? [1]
(A) Elements and their ratio in a compound
(B) Only the compound's name
(C) Only its colour
(D) Nothing useful
10. What does CO2 represent? [1]
(A) One carbon and two oxygen atoms
(B) Two carbon and one oxygen atom
(C) Only carbon
(D) Only oxygen
11. What is a balanced equation? [1]
(A) One with equal atoms on both sides
(B) One with unequal atoms
(C) One with no atoms
(D) One with only reactants
12. What law does balancing follow? [1]
(A) Conservation of mass
(B) Conservation of energy only
(C) No specific law
(D) Random assignment
13. How many hydrogen atoms are in 2H2 + O2 → 2H2O? [1]
(A) 4 on each side
(B) 2 on each side
(C) 8 on each side
(D) 1 on each side
14. Why balance chemical equations? [1]
(A) To follow the conservation of mass
(B) To make equations longer
(C) No reason
(D) It's optional
15. Why is chemical language useful? [1]
(A) It enables precise global communication
(B) No reason
(C) It's not useful
(D) Only for tests
16. What does a chemical equation show? [1]
(A) Reactants forming products
(B) Only reactants
(C) Only products
(D) Neither