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pH value gk questions and answers

 • Top MCQ Q&A Notes related to pH which is very important for various competitive exams.


 1. What is the pH value :-

 A. negative log value of oxygen ion concentration.

 B. negative log value of OH-  ion concentration.

 C. Negative log value of hydrogen ion concentration.

 D. negative log value of nitrogen ion concentration.

 Ans: C. Negative log value of hydrogen ion concentration.


 2. The range of pH value is :-

 A. 0 to 14

 B. 0 to 7

 C. 0 to 10

 D.  7 to 14

 Ans : A. 0 to 14


 3. The pH  value of an acid is :-

 A. 0

 B. 7

 C. more than 7 

 D. less than 7

 Ans: D. Less than 7


 4. The pH  value of alkali is :-

 A.  14

 B.  more than 7

 C. less than 7

 D.  0

 Ans : B. More than 7


 5. What is the pH value of neutral solution :-

 A. 7

 B. 14

 C. 0 

 D. 1

 Ans : A. 7


 6. How much change in pH value of human blood can kill a man :-

 A. 1 pH unit

 B. 0.3 pH  unit

 C. 0.2 pH unit

 D.  2 pH unit

 Ans : C. 0.2 pH unit


 7. What is pOH value:-

 A.  double the pH value.

 B.  Three times the pH value.

 C.  Negative log of  OH-  ion concentration.

 D.  Positive log of H+  ion concentration.

 Ans: C. Negative log of OH-  ion concentration.


 8.  What is the pH value of lemon juice :-

 A. 1.5 to 2.0

 B.  2.25 to 2.40

 C.  3.5 to 4.5

 D.  0 to 1

 Ans : B. 2.25 to 2.40


 9. What is the pH value of human blood :-

 A.  7.4

 B.  8.2

 C.  6.2

 D.  9.5

 Ans : A. 7.4


 10. If the pH value of a solution is 0 , then what will be its pOH value?

 A.  0

 B.  1

 C.  7

 D.  14

 Ans : D. 14


 11. If the pOH value of a solution is 0 , then what will be its pH value?

 A.  0

 B. 14

 C.  7

 D.  10

 Ans : 14


 12. The following is the relation between pH value and pOH value:-

 A.  pH = 14 - pOH

 B.  pH =  pOH - 14

 C.  pH = pOH + 14

 D.  pOH = 14 + pH

 Ans : A.  pH =  14 - pOH


 13. What is the pH value of milk :-

 A. 2.8

 B. 6.8

 C. 4.6

 D. 5.8

 Ans : B. 6.8


 14. What is the pH value of human saliva :-

 A. 4.5 - 5.7

 B.  3.2 - 4.0

 C.  5.5 - 6.5

 D.  6.5  - 7.5

 Ans : D. 6.5 - 7.5


 15. What is the pH value of tomato juice :-

 A. 2.5 - 2.9

 B. 3.4

 C. 4.0 - 4.5

 D.  5.2 -6.3

 Ans : C. 4.0 - 4.5


 16.  If the pH of a solution is known, then [H+]  of that solution will be :-

 A.  10⁻pH

 B.  10pH

 C.  log 10pH

 D.  2log10pH


 Ans: A. 10⁻pH


 17. The [H+] ion concentration of x,y and z are respectively 10⁻²,10⁻³,10⁻⁵  then the pH values ​​of x,y,z will be respectively :-

 A. 5, 3,2

 B. 2,5 ,3

 C. 2, 3, 5

 D. None of these.

 Ans: C. 2,3,5


 18. What is the pH value of vinegar :-

 A. 2.4

 B. 5.6

 C. 3.8

 D. 4.2

 Ans: A. 2.4


 19. What is the pH value of alcohol :-

 A. 2.8

 B. 3.5

 C. 4.0

 D. 5.8

 Ans : A. 2.8


 20. What is the pH value of human urine :-

 A. 6.7

 B. 7.8

 C. 4.8

 D. 3.8

 Ans : C. 4.8


 21. Why lime is put in the fish rearing pond :-

 A. To reduce the pH value of water.

 B. To clean the water.

 C. To kill other harmful organisms in the water.

 D. To increase the pH value of water.

 Ans: D. To increase the pH value of water.


 22. Which of the following represents pH value :-

 A.  log10[H⁺]

 B.  - log[H⁺]

 C.  log[H⁺]

 D.  -log10[H⁺]

 Ans:- B. -log[H⁺]


 23. Which of the following represents the pOH value :-

 A.  - log[ OH⁻]

 B.  log [OH⁻]

 C.  log10[OH⁻]

 D.  - logo[OH⁻]

 Ans: A. -log [OH⁻]


 24. The pH value of a strong acid ranges from :-

 A.  2 to 4

 B.  4 to 7

 C.  0 to 2

 D.  0 to 4

 Ans : C. 0 to 2


 25. What is the pH value of strong base :-

 A. 7 to 10

 B. 10 to 12

 C.  10 to 14

 D.  12 to 14

 Ans: D. 12 to 14


 26. What is the pH value of sea water :-

 A. 4.7

 B. 14

 C.  10.6

 D.  8.4

 Ans : D. 8.4


 27. If the pH value of a solution is 4 , then what will be the pOH value of that solution?

 A.  8

 B.  10

 C.  3

 D.  9

 Ans: B. 10  (Note: pOH = 14 - pH)


 28. What is the pH value of lime water :-

 A.  10.5

 B.  11.7

 C.  6.9

 D.  9.7

 Ans: A.  10.5


 29. pH value of human saliva after meal :-

 A. increases.

 B. decreases.

 C. remains unchanged.

 D. becomes zero.

 Ans: B. Decreases.


 30. In which of the following field pH value is not important :-

 A. Fish farming

 B. Cultivation

 C. Food Preservation

 D. Sericulture

 Ans: D. Sericulture


 31. The pH value of a weak base is in the range of :-

 A.  7 -10

 B.  7 - 14

 C.  12 - 14

 D.  7 - 8

 Ans : A. 7- 10


 32. What is the pH value of human tear :-

 A.  8.3

 B.  6.8

 C.  7.4

 D.  7.9

 Ans : C. 7.4


 33. Who discovered the pH value :-

 A. Sorensen

 B. Linnaeus

 C. Labozier

 D. Ahrenheus

 Ans: A. Sorensen


 34. What is the pH value of salt :-

 A.  14

 B.  12

 C.  7

 D.  10

 Ans: C. 7


 35. What is the effect of temperature on the pH of a solution?

 A. Decreases with increase in temperature.

 B. Increases with increase in temperature.

 C. Decreases on decreasing temperature.

 D. remains unchanged as the temperature increases or decreases.

 Ans: A. It decreases with increase in temperature.


 36. What is the pH value of bile juice :-

 A.  5.6

 B.  8.6

 C.  7.7

 D.  6.5

 Ans: C. 7.7


 37. What is the effect of the use of chemical fertilizers on the soil :-

 A. The acidity of the soil increases.

 B. The alkalinity of the soil increases.

 C. The pH value of the soil becomes zero.

 D. None of this.

 Ans: B. The alkalinity of the soil increases.


 38. What will be the pH value of 0.001 M  HCl acid?

 A.  2

 B.  3

 C.  4

 D.  1

 Ans: B. 3 ( Note : 0.001 = 1 × 10⁻³, refer: Q.n. 16)


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