Acids and Bases MCQs

41. Which of the following species is the conjugate acid of ( NH_3 )?

• A) ( NH_2^- )
• B) ( NH_4^+ )
• C) ( NH_3 )
• D) ( H_2 )
• Answer: B

42. In a neutralization reaction, an acid reacts with a base to form:

• A) Water only
• B) Salt only
• C) Salt and water
• D) Gas
• Answer: C

43. **What is the pH of a solution if the concentration of ( OH^- ) is ( 1 \times 10^{-

3} M )?**

• A) 3
• B) 11
• C) 7
• D) 14
• Answer: B

44. Which acid is found in vinegar?

• A) Sulfuric acid
• B) Acetic acid
• C) Hydrochloric acid
• D) Citric acid
• Answer: B

45. In the reaction ( NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^- ), ( NH_3 ) acts as:

• A) A Bronsted-Lowry acid
• B) A Bronsted-Lowry base
• C) A Lewis acid
• D) A neutral molecule
• Answer: B

46. Which of the following substances will increase the concentration of H⁺ ions in solution?

• A) NaOH
• B) HCl
• C) NH₃
• D) NaCl
• Answer: B

47. A base that partially ionizes in water is called:

• A) A strong base
• B) A weak base
• C) A neutral base
• D) An acidic base
• Answer: B

48. In a titration of HCl with NaOH, the pH at the equivalence point is:

• A) 1
• B) 3
• C) 7
• D) 11
• Answer: C

49. The ion responsible for the acidity of a solution is:

• A) ( OH^- )
• B) ( H_3O^+ )
• C) ( Cl^- )
• D) ( Na^+ )
• Answer: B

50. Which of the following is a characteristic of a strong acid?

• A) Fully dissociates in water
• B) Partially dissociates in water
• C) Does not dissociate in water
• D) Accepts a proton
• Answer: A