Do You Have Knowledge About Acids And Bases?
A mixture of dyes is called universal indicator. This is more useful than litmus as it can be used to measure how strong an acid or an alkali is using the pHscale. A pH of 7 is neutral (like for example water); a pH of 1 or 2 is a strong acid (for example sulfuric acid); weak acids like vinegar have a pH of 3 to 6. Weak alkalis (like soap) have pH values of 8 to 10 and a strong alkali like sodium hydroxide will have a pH of 13 or 14.
- 1.
Which of the following pH numbers indicate a strong alkali?- A.
1
- B.
5
- C.
9
- D.
14
- 2.
Which of the following acids do we have in our stomach?
- A.
Ethanoic acid
- B.
Hydrochloric acid
- C.
Nitric acid
- D.
Sulfuric acid
- 3.
Which of the following substances contain acid?
- A.
An orange
- B.
Bleach
- C.
Distilled water
- D.
Washing powder
- 4.
Which of the following pH numbers indicates a strong acid?
- A.
1
- B.
5
- C.
7
- D.
14
- 5.
Which of the following substances contain an alkali?
- A.
Baking powder
- B.
Coca cola
- C.
Distilled water
- D.
Vinegar
- 6.
What colour is universal indicator in strong acid?
- A.
Green
- B.
Orange
- C.
Purple
- D.
Red
- 7.
Strong acids and strong alkalis are.......
- A.
Able to turn blue litmus paper red
- B.
Corrosive and/or caustic
- C.
Sour
- D.
Sweet
- 8.
What colour is universal indicator in a strong alkali?
- A.
Green
- B.
Orange
- C.
Purple
- D.
Red
- 9.
What colour is universal indicator in a neutral solution?
- A.
Green
- B.
Orange
- C.
Purple
- D.
Red
- 10.
Which of the following pH numbers indicates a neutral substance?
- A.
1
- B.
5
- C.
7
- D.
14
Questions: 9 | Attempts: 18755 | Last updated: Mar 22, 2022
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