Acids, Bases and Salts

Grade 9 Science — Acids, Bases and Salts: 25 practice questions with instant scoring and explanations.

1. What is the pH range for acids?
2. A solution with pH 10 is:
3. If a solution has [H⁺] = 10⁻³ mol/L, what is its pH?
4. Which indicator turns red in acidic solution and blue in basic solution?
5. When a strong acid and strong base react, the salt formed is:
6. The reaction HCl + NaOH → NaCl + H₂O is an example of:
7. Which of the following is a common salt?
8. What turns phenolphthalein solution pink?
9. Acid rain is primarily caused by the presence of:
10. What is the pH of a neutral solution at 25°C?
11. When methyl orange is added to a solution, it turns red. The solution is:
12. A salt formed from a weak acid and strong base will have a pH:
13. Which gas is responsible for acid rain when it dissolves in water?
14. If pH = 12, what is the pOH of the solution?
15. Calcium hydroxide [Ca(OH)₂] is classified as:
16. What is the purpose of using indicators in acid-base titration?
17. Common salt (NaCl) is obtained by the neutralisation of:
18. What colour change occurs when litmus paper is placed in a strong base?
19. The pH scale ranges from:
20. Which of the following salts is deliquescent?
21. When H₂SO₄ and Cu(OH)₂ react, the salt formed is:
22. A solution has [H⁺] = 10⁻⁵. It is:
23. Which statement about acid rain is correct?
24. If we add an acid to a salt solution and the solution becomes acidic, the original salt was from:
25. The degree of ionisation of an acid is represented by: