Acid and Bases MCQs

31. Which acid is diprotic?
A) HCl
B) HNO₃
C) H₂SO₄
D) CH₃COOH
Answer: C

32. Which base is strongest?
A) NH₄OH
B) NaOH
C) Mg(OH)₂
D) Al(OH)₃
Answer: B

33. Which solution has highest pH?
A) Acid
B) Neutral
C) Base
D) Salt
Answer: C

34. Which acid is organic?
A) HCl
B) H₂SO₄
C) CH₃COOH
D) HNO₃
Answer: C

35. Which is a universal indicator?
A) Litmus
B) Methyl orange
C) Indicator mixture
D) Phenolphthalein
Answer: C

36. What happens to blue litmus in acid?
A) Turns red
B) Remains blue
C) Turns green
D) Turns yellow
Answer: A

37. What happens to red litmus in base?
A) Turns blue
B) Remains red
C) Turns green
D) Turns yellow
Answer: A

38. Which acid is monobasic?
A) H₂SO₄
B) H₃PO₄
C) HCl
D) H₂CO₃
Answer: C

39. Which base contains NH₃?
A) NaOH
B) NH₄OH
C) KOH
D) Ca(OH)₂
Answer: B

40. Which acid is used in fertilizers?
A) HNO₃
B) HCl
C) CH₃COOH
D) H₂CO₃
Answer: A