Acid and Bases MCQs

41. What is formed when acid reacts with carbonate?
A) Salt + Water
B) Salt + CO₂ + Water
C) Salt + H₂
D) Salt only
Answer: B

42. Which compound is basic in nature?
A) NH₃
B) CO₂
C) SO₂
D) HCl
Answer: A

43. Which acid is trivalent?
A) HCl
B) H₃PO₄
C) HNO₃
D) H₂SO₄
Answer: B

44. Which pH indicates strong acid?
A) 1
B) 7
C) 10
D) 14
Answer: A

45. Which pH indicates strong base?
A) 2
B) 5
C) 10
D) 13
Answer: D

46. Which is a basic oxide?
A) CO₂
B) SO₂
C) CaO
D) NO₂
Answer: C

47. Which is an acidic oxide?
A) CaO
B) MgO
C) CO₂
D) Na₂O
Answer: C

48. What is the role of indicator?
A) Change temperature
B) Show pH change
C) Produce gas
D) Form salt
Answer: B

49. Which acid is present in stomach?
A) HCl
B) H₂SO₄
C) HNO₃
D) CH₃COOH
Answer: A

50. Which base neutralizes acid in stomach medicine?
A) NaCl
B) Mg(OH)₂
C) CO₂
D) HCl
Answer: B