Secondary 2 Science Normal Academic Topic: Acids and Alkalis Test Duration: 1 Hour Total Marks: 40
Part A: Multiple Choice Questions (1 mark each) Circle the correct answer.
- Which of the following is not a characteristic property of an acid?
- A) Sour taste
- B) Turns blue litmus red
- C) Turns red litmus blue
- D) Reacts with metals to produce hydrogen gas
- Which solution is likely to have a pH value of 8?
- A) Vinegar
- B) Baking soda solution
- C) Lemon juice
- D) Black coffee
- What is the color of phenolphthalein in a neutral solution?
- A) Pink
- B) Colorless
- C) Yellow
- D) Blue
- Which of the following is an example of a strong base?
- A) Ammonia
- B) Hydrochloric acid
- C) Sodium hydroxide
- D) Acetic acid
- The pH scale measures:
- A) Acidity only
- B) Alkalinity only
- C) Both acidity and alkalinity
- D) Neither acidity nor alkalinity
Part B: Short Answer Questions (5 marks each) Answer the following questions briefly.
- Describe how you can use litmus paper to test whether a solution is acidic or basic.
- Explain why acids are able to conduct electricity.
- Name two safety precautions that should be taken when handling acids and alkalis in the laboratory.
- What happens when an acid reacts with a metal carbonate? Write a balanced chemical equation for the reaction between hydrochloric acid and calcium carbonate.
- Define the term “neutralization”. Give one everyday example of a neutralization reaction.