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1. What is the pH range of acids? A) 0–6 B) 7 C) 8–14 D) 5–10
A) 0–6
2. A solution turns universal indicator red. What does this tell us? A) It's neutral B) It's strongly acidic C) It's strongly basic D) It's weakly basic
B) It's strongly acidic
3. Which of the following is a base? A) Vinegar B) Lemon juice C) Soap D) Orange juice
C) Soap
4. What color does an acid turn litmus paper? A) Blue B) Green C) Red D) Purple
C) Red
5. Which everyday substance is an acid? A) Milk of magnesia B) Toothpaste C) Lemon juice D) Baking soda
C) Lemon juice
6. What is the pH value of a neutral substance like water? A) 0 B) 7 C) 10 D) 14
B) 7
7. Which of these is NOT acidic? A) Lemon B) Vinegar C) Soap D) Cola
C) Soap
8. What is the pH range of bases? A) 0–6 B) 7 C) 8–14 D) 1–7
C) 8–14
9. What type of substance is baking soda? A) Acid B) Base C) Neutral D) Salt
B) Base
10. Which one is a neutral substance? A) Salt water B) Milk C) Pure water D) Apple juice
C) Pure water
11. What is a base? A) Tastes sour B) Turns blue litmus red C) Has a pH above 7 D) Makes gas bubbles in water
C) Has a pH above 7
12. Which of these substances is acidic? A) Ammonia B) Lemon juice C) Bleach D) Soap
B) Lemon juice
13. What color does a base turn universal indicator? A) Red B) Yellow C) Blue or Purple D) Orange
C) Blue or Purple
14. Orange juice is an acid because it has: A) A pH above 7 B) A sweet taste C) A pH below 7 D) Blue color in water
C) A pH below 7
15. What do we use to measure how acidic or basic a substance is? A) Thermometer B) Scale C) pH scale D) Timer
C) pH scale
16. Which of these is the best way to test whether a substance is acidic or basic at home? A) Smell the substance B) Taste it carefully C) Use red cabbage juice as an indicator D) Heat it and observe
C) Use red cabbage juice as an indicator
