quiz

PH Scale and Indicators

1. Who introduced the concept of pH?

  • A) Robert Boyle
  • B) Louis Pasteur
  • C) Linus Pauling
  • D) Soren Peder Lauritz Sørensen
D) Soren Peder Lauritz Sørensen Explanation

2. What does the term “pH” stand for in chemistry? 

  • A) Potential of Hydrogen
  • B) Power of Hydrogen
  • C) Protonic Hydrogen
  • D) Potential Hydroxide
A) Potential of Hydrogen Explanation

3. What is the pH of pure water at 25°C? 

  • A) 0
  • B) 7
  • C) 14
  • D) 5
B) 7 Explanation

4. Which natural indicator turns blue in a basic solution and red in an acidic solution?

  • A) Turmeric
  • B) Hydrangea
  • C) Litmus
  • D) Cochineal solution
C) Litmus Explanation

5. Which of the following substances falls within the basic pH range?

  • A) Battery acid
  • B) Vinegar
  • C) Orange juice
  • D) Seawater
D) Seawater Explanation

6. What can you understand about the nature of a solution if its pH is zero?

  • A) It is neutral
  • B)  It is acidic
  • C) It is basic
  • D) It is alkaline
B)  It is acidic Explanation

7. Which of the following substances found in plants can be used as a pH indicator? 

  • A) Chlorophyll
  • B) Anthocyanin
  • C) Lignin
  • D) Starch
B) Anthocyanin Explanation

8. What is the pH value of human blood?

  • A) pH 6.0 to 6.5
  • B) pH 7.0 to 7.5
  • C)  pH 7.35 to 7.45
  • D) pH 8.0 to 8.5
C) pH 7.35 to 7.45 Explanation

9. What colour do hydrangea flowers turn when planted in alkaline soils?

  • A) Blue
  • B) Pink or pinkish red. 
  • C) White
  • D) Yellow
B) Pink or pinkish red.  Explanation

10. Which kind of indicator undergoes a smell change when combined with an acidic or basic solution?

  • A) Taste indicator
  • B) Universal indicator
  • C) Synthetic indicator
  • D) Olfactory indicator
D) Olfactory indicator Explanation

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