Acid and Base MCQs

By: Prof. Dr. Fazal Rehman | Last updated: July 10, 2025

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1. : Which is not a Lewis base?





2. : The difference in the pH of arterial and venous blood is very minor because of the interaction between:





3. : Which concept is also called a proton-donor acceptor system?





4. : Which concept is also called an electron pair-donor acceptor system?





5. : The pKa of an acid is defined as





6. : According to ______, “Acids are substances whose aqueous solutions turned blue litmus red and tasted sour.”





7. : An acid is a substance that results in __.





8. : Which is not a fixed acid?





9. : Which acid-base condition is characterized by primary carbonic acid excess?





10. : According to which effect, all the strong acids have very close pKa values and they seem to have approximately equal strengths in aqueous solutions?





11. : Relative order of acidity of HF, HCl, HBr and HI acids is:

14. : The ionic product equilibrium constant of water is:





15. : Which is not true with respect to buffers?





16. : The value of Kw increases with temperature ______.





17. : The bicarbonate buffer system of our body has pK _______.





18. : What is the pH of tears?





19. : What is the pH of milk?





20. : What is the pH of the 0.1 M HCl solution?





21. : What is the pH of 1 M HCl?





22. : The sum of pH and pOH is equal to:





23. : Buffer solutions are helpful and used to:





24. : A mixture of weak acid and its salt is called:





25. : Glass electrode cannot be helpful and used to measure the pH of pure:





26. : The pH value 4.2 is typical of:





27. : If the pH of a solution is 1, its pOH will be:





28. : Which is not a Lowery-Bronsted acid?





29. : Which is not a Lowery-Bronsted base?





30. : Which is not a Lewis acid?





31. : Which is not true with respect to strong acids?





32. : Which amino acid is responsible for buffer action in blood?





33. : Which amino acid has S-S bond?





34. : Which buffer is not present in the blood?





35. : Which is not true with respect to carbonate buffers?





36. : What is the approximate percentage of water in the human body?





37. : What is the percentage of intracellular fluids in the body?





38. : How much metabolic water is produced per 100 calories of energy in the human body?





39. : Which macronutrient results in the highest amount of metabolic water (per gram oxidation)?





40. : Which ion has a higher concentration in the extracellular compartment than intracellular?





41. : Which does not contribute to the osmolality?





42. : Which of the following happens due to the Donnan effect?





43. : Which is minimum?





44. : What is the pH of blood?





45. : Which is not true with respect to pKa value?





46. : Which aqueous solution has the lowest pH value?





47. : Which mixture does not act as a buffer?





48. : Which statement is not true about amino acid glycine?





49. : Which combinations are helpful to prepare buffers of pH 7.0?





50. : The pH of the human stomach is?





More Biochemistry MCQs

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  2. Carbohydrate MCQs
  3. Proteins MCQs
  4. Lipids and Biomembranes MCQs
  5. Nucleic acids MCQs
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  11. Biotechnology MCQs 2
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