Question Paper
Class / Subject: Class 9 (ICSE) · Chemistry
Chapter: Chapter 3 — Chapter 3: Water
Time Allowed: 32 minutes
Max Marks: 16
1. What is water's chemical formula? [1]
(A) H2O
(B) H2O2
(C) HO
(D) H3O
2. Why is water called the 'universal solvent'? [1]
(A) It dissolves many different substances
(B) It dissolves nothing
(C) It's the only liquid on Earth
(D) It has no solvent properties
3. What does hard water contain? [1]
(A) Dissolved calcium and magnesium salts
(B) Only pure H2O
(C) No dissolved substances
(D) Only oxygen
4. What issue does hard water cause? [1]
(A) Scale formation and reduced soap lather
(B) Better soap lather
(C) No issues at all
(D) Increased water purity
5. What is soft water? [1]
(A) Water lacking dissolved calcium and magnesium salts
(B) Water with excess salts
(C) The same as hard water
(D) Water with no minerals ever added intentionally
6. What is soft water better for? [1]
(A) Washing and preventing scale buildup
(B) Nothing specific
(C) Only drinking, nothing else
(D) Causing more scale
7. What are methods of water purification? [1]
(A) Filtration, boiling, distillation
(B) Only boiling
(C) Only filtration
(D) No methods exist
8. Why purify water? [1]
(A) To remove impurities and make it safe
(B) No reason
(C) It's not necessary
(D) Only for taste
9. What is water's chemical formula? [1]
(A) H2O
(B) H2O2
(C) HO
(D) H3O
10. Why is water called the 'universal solvent'? [1]
(A) It dissolves many different substances
(B) It dissolves nothing
(C) It's the only liquid on Earth
(D) It has no solvent properties
11. What does hard water contain? [1]
(A) Dissolved calcium and magnesium salts
(B) Only pure H2O
(C) No dissolved substances
(D) Only oxygen
12. What issue does hard water cause? [1]
(A) Scale formation and reduced soap lather
(B) Better soap lather
(C) No issues at all
(D) Increased water purity
13. What is soft water? [1]
(A) Water lacking dissolved calcium and magnesium salts
(B) Water with excess salts
(C) The same as hard water
(D) Water with no minerals ever added intentionally
14. What is soft water better for? [1]
(A) Washing and preventing scale buildup
(B) Nothing specific
(C) Only drinking, nothing else
(D) Causing more scale
15. What are methods of water purification? [1]
(A) Filtration, boiling, distillation
(B) Only boiling
(C) Only filtration
(D) No methods exist
16. Why purify water? [1]
(A) To remove impurities and make it safe
(B) No reason
(C) It's not necessary
(D) Only for taste