Science: Middle School: Grades 6, 7 and 8 Quiz - Acids and Alkalis (Questions)

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As a Science student, you will be familiar with using pH indicators to tell whether a substance is acidic, alkaline or neutral.

See how much you have learned by trying this quiz dealing with Acids and Alkalis.

1. Which of the following substances contain acid?
[ ] An orange
[ ] Bleach
[ ] Distilled water
[ ] Washing powder
2. Which of the following substances contain an alkali?
[ ] Baking powder
[ ] Coca cola
[ ] Distilled water
[ ] Vinegar
3. Which of the following pH numbers indicates a neutral substance?
[ ] 1
[ ] 5
[ ] 7
[ ] 14
4. Which of the following pH numbers indicates a strong acid?
[ ] 1
[ ] 5
[ ] 7
[ ] 14
5. Which of the following pH numbers indicate a strong alkali?
[ ] 1
[ ] 5
[ ] 9
[ ] 14
6. Which of the following acids do we have in our stomach?
[ ] Ethanoic acid
[ ] Hydrochloric acid
[ ] Nitric acid
[ ] Sulphuric acid
7. What color is universal indicator in strong acid?
[ ] Green
[ ] Orange
[ ] Purple
[ ] Red
8. What color is universal indicator in a neutral solution?
[ ] Green
[ ] Orange
[ ] Purple
[ ] Red
9. What color is universal indicator in a strong alkali?
[ ] Green
[ ] Orange
[ ] Purple
[ ] Red
10. Strong acids and strong alkalis are.......
[ ] Able to turn blue litmus paper red
[ ] Corrosive and/or caustic
[ ] Sour
[ ] Sweet
Science: Middle School: Grades 6, 7 and 8 Quiz - Acids and Alkalis (Answers)
1. Which of the following substances contain acid?
[x] An orange
[ ] Bleach
[ ] Distilled water
[ ] Washing powder
Citrus fruit (oranges, lemons etc) contain citric acid
2. Which of the following substances contain an alkali?
[x] Baking powder
[ ] Coca cola
[ ] Distilled water
[ ] Vinegar
3. Which of the following pH numbers indicates a neutral substance?
[ ] 1
[ ] 5
[x] 7
[ ] 14
4. Which of the following pH numbers indicates a strong acid?
[x] 1
[ ] 5
[ ] 7
[ ] 14
5. Which of the following pH numbers indicate a strong alkali?
[ ] 1
[ ] 5
[ ] 9
[x] 14
Hydrangea flowers can be blue or pink depending on the pH of the soil
6. Which of the following acids do we have in our stomach?
[ ] Ethanoic acid
[x] Hydrochloric acid
[ ] Nitric acid
[ ] Sulphuric acid
The acid kills bacteria
7. What color is universal indicator in strong acid?
[ ] Green
[ ] Orange
[ ] Purple
[x] Red
8. What color is universal indicator in a neutral solution?
[x] Green
[ ] Orange
[ ] Purple
[ ] Red
9. What color is universal indicator in a strong alkali?
[ ] Green
[ ] Orange
[x] Purple
[ ] Red
10. Strong acids and strong alkalis are.......
[ ] Able to turn blue litmus paper red
[x] Corrosive and/or caustic
[ ] Sour
[ ] Sweet