Question Paper
Class / Subject: Class 9 (ICSE) · Chemistry
Chapter: Chapter 2 — Chapter 2: Chemical Changes and Reactions
Time Allowed: 32 minutes
Max Marks: 16
1. What is a combination reaction? [1]
(A) Forming one product from reactants
(B) Breaking one substance apart
(C) An element replacing another
(D) No reaction occurring
2. What is a decomposition reaction? [1]
(A) Breaking down one compound into simpler substances
(B) Combining substances
(C) An element replacing another
(D) No reaction occurring
3. What might a decomposition reaction need? [1]
(A) Heat, light or electricity
(B) Nothing at all
(C) Only cold temperatures
(D) Only darkness
4. What is a displacement reaction? [1]
(A) A reactive element replacing a less reactive one
(B) Substances simply combining
(C) One substance breaking apart randomly
(D) No reaction occurring
5. What is an example of displacement? [1]
(A) Zinc displacing copper from copper sulfate
(B) Water forming from hydrogen and oxygen
(C) Water breaking apart
(D) Nothing specific
6. What is a double displacement reaction? [1]
(A) An exchange of ions between two compounds
(B) A single substance breaking apart
(C) One element replacing another
(D) No reaction occurring
7. What does a double displacement reaction often produce? [1]
(A) A precipitate (insoluble solid)
(B) Only gas
(C) Only heat
(D) Nothing specific
8. Why study reaction types? [1]
(A) To predict outcomes and identify patterns
(B) No reason
(C) It's not useful
(D) Only for tests
9. What is a combination reaction? [1]
(A) Forming one product from reactants
(B) Breaking one substance apart
(C) An element replacing another
(D) No reaction occurring
10. What is a decomposition reaction? [1]
(A) Breaking down one compound into simpler substances
(B) Combining substances
(C) An element replacing another
(D) No reaction occurring
11. What might a decomposition reaction need? [1]
(A) Heat, light or electricity
(B) Nothing at all
(C) Only cold temperatures
(D) Only darkness
12. What is a displacement reaction? [1]
(A) A reactive element replacing a less reactive one
(B) Substances simply combining
(C) One substance breaking apart randomly
(D) No reaction occurring
13. What is an example of displacement? [1]
(A) Zinc displacing copper from copper sulfate
(B) Water forming from hydrogen and oxygen
(C) Water breaking apart
(D) Nothing specific
14. What is a double displacement reaction? [1]
(A) An exchange of ions between two compounds
(B) A single substance breaking apart
(C) One element replacing another
(D) No reaction occurring
15. What does a double displacement reaction often produce? [1]
(A) A precipitate (insoluble solid)
(B) Only gas
(C) Only heat
(D) Nothing specific
16. Why study reaction types? [1]
(A) To predict outcomes and identify patterns
(B) No reason
(C) It's not useful
(D) Only for tests