quiz

Bases

1. What physical sensation is often felt when touching a base?

  • A) Rough texture
  • B) Slippery or soapy feel
  • C) Dry and powdery texture
  • D) Sticky sensation
B) Slippery or soapy feel Explanation

2. Bases often contain the following ions:

  • A) Hydrogen ions
  • B) Chloride ions
  • C) Hydroxide ions
  • D) Sulfate ions
C) Hydroxide ions Explanation

3. Which of the following substances is commonly known as “quicklime”? 

  • A)  Calcium sulfate (CaSO4)
  • B) Sodium chloride (NaCl)
  • C) Calcium carbonate (CaCO3)
  • D) Calcium oxide (CaO)
D) Calcium oxide (CaO) Explanation

4. Which taste is frequently connected to bases?

  • A) Sour taste
  • B) Sweet taste
  • C) Bitter taste
  • D) Salty taste
C) Bitter taste Explanation

5. What is usually referred to as “slaked lime”? 

  • A) Calcium sulfate (CaSO4)
  • B) Sodium chloride (NaCl)
  • C) Calcium hydroxide (Ca(OH)2)
  • D) Calcium oxide (CaO)
C) Calcium hydroxide (Ca(OH)2) Explanation

6. Which color change would you observe when a base reacts with a phenolphthalein indicator?

  • A)  Blue to red
  • B) Colorless to pink
  • C)  Colorless
  • D) Yellow to orange
B) Colorless to pink Explanation

7. Which of the following bases is commonly used as an antacid? 

  • A) Sodium chloride (NaCl)
  • B) Aluminum oxide (Al₂O₃)
  • C) Potassium sulfate (K2SO4)
  • D) Magnesium hydroxide (Mg(OH)2)
D) Magnesium hydroxide (Mg(OH)2) Explanation

8. Which base is used as an ingredient in soda acid fire extinguishers?

  • A) Calcium hydroxide
  • B) Sodium bicarbonate
  • C) Ammonium hydroxide
  • D) Sodium hydroxide
B) Sodium bicarbonate Explanation

9. What is the common name for the chemical compound KOH?

  • A) Hydrochloric acid
  • B)  Sulfuric acid
  • C) Caustic potash
  • D) Vinegar
C) Caustic potash Explanation

10. What effect does a base have on red litmus paper? 

  • A) No change
  • B) Turns it red
  • C) Turns it blue
  • D) Turns it green
C) Turns it blue Explanation

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