Grade 7 Integrated Science – Acids,bases and indicators Quiz
1. What is an indicator?
2. There are.......types of indicators.
3. Which of the following are types of indicators?
4. Which one is not a laboratory indicator?
5. Litmus solution turns.......in acids.
6. Litmus solution turns.......in bases .
7. Which of the is a basic solution?
8. What is the colour observed when phenolphthalein indicator is added to a neutral solution?
9. What is the colour observed when phenolphthalein indicator is added to a basic solution?
10. What is the colour observed when phenolphthalein indicator is added to an acidic solution?
11. What is the colour observed when litmus solution is added to a neutral solution?
12. What is the colour observed when litmus solution is added to an acidic solution?
13. What is the colour observed when litmus solution is added to a basic solution?
14. What is the colour observed when Methyl orange indicator is added to a neutral solution?
15. What is the colour observed when Methyl orange indicator is added to a basic solution?
16. What is the colour observed when Methyl orange indicator is added to an acidic solution?
17. How can we differentiate between strong and weak acids or bases?By using..........
18. Neutral substances have a pH value of?
19. Acids have a pH value of?
20. Strong acids have a pH value ranging from?
21. Weak acids have a pH value ranging from?
22. Bases have a pH value ranging from?
23. Weak bases have a pH value ranging between?
24. Strong bases have a pH value ranging from?
25. Which one are strong acids?
26. Which of the following are weak acids?
27. Which of the following are Neutral solutions?
28. Identify weak bases.
29. Identify strong bases.
30. Identify two uses of acid- base indicators.
31. Which one is an application of acids in day-to-day life?
32. The following are uses of bases in day-to-day life.Which one is not?
33. Which of the following is a property of acids?
Acids turn blue litmus paper red. Blue litmus paper remains blue when in contact with bases.
34. Which of the following is a common indicator for acids?
Red cabbage juice changes color to indicate the presence of acids. It turns red in acids and green in bases.
35. Which of the following is a characteristic of bases?
Bases turn red litmus paper blue. Red litmus paper remains red when in contact with acids.
36. Which of the following substances is an example of a strong acid?
Hydrochloric acid is a strong acid that can fully dissociate in water to release a large number of hydrogen ions.
37. How does an indicator help in distinguishing between acids and bases?
Indicators change color depending on the pH of the solution, helping to differentiate between acidic and basic substances.
38. Which of the following is a household product that is acidic?
Lemon juice contains citric acid, which gives it its characteristic sour taste and acidic properties.
39. What happens to the pH value when an acid is added to water?
When an acid is added to water, the concentration of hydrogen ions increases, causing the pH to decrease and become more acidic.
40. Which substance is commonly used to neutralize acids in a laboratory setting?
Sodium hydroxide is a strong base that can neutralize acids by reacting with hydrogen ions to form water and a salt.
41. What color does phenolphthalein turn in the presence of a base?
Phenolphthalein turns purple in the presence of bases, indicating the basic nature of the solution.
42. Which of the following is a characteristic of a neutral solution?
A neutral solution has a pH of 7, indicating an equal concentration of hydrogen and hydroxide ions.