PRE-TEST DIRECTION: Read the questions carefully and choose the letter of the BEST answer.
1. Which of the following materials can be a source of natural acid base indicator? A. Sodium chloride B. Red cabbage C. Vinegar D. Calamansi Juice
2. Which of the following mixture WILL NOT change the color of the litmus paper? A. bleach B. detergent C. vinegar D. drain cleaner
3. The following statement about acid are true EXCEPT___. A. Acid turn litmus paper to red B. Acids improve the strength of metals. C. Acids have pH value lower than 7. D. Acids neutralize bases
4. Hydrochloric acid commonly known as muriatic acid is a corrosive substance. What particular materials or materials will it damage? I. plastic. III. iron II. paper. IV. copper A. I only C. II only B. II and III D. III and IV
5. Which of the following materials contain acidic mixtures? A. fruit drinks B. chlorinate water C. detergent powder D. shampoo
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Answer:
1. C
2.. A
3. D
4. D
5. B