Acid and Bases MCQs

91. Which acid is carbonic acid?
A) H₂CO₃
B) HCl
C) HNO₃
D) H₂SO₄
Answer: A

92. Which acid is formed when CO₂ dissolves in water?
A) HCl
B) H₂CO₃
C) HNO₃
D) H₂SO₄
Answer: B

93. Which compound increases pH?
A) Acid
B) Base
C) Salt
D) Water
Answer: B

94. Which compound decreases pH?
A) Base
B) Acid
C) Salt
D) Water
Answer: B

95. Which acid is used in laboratories most commonly?
A) HCl
B) H₂SO₄
C) HNO₃
D) CH₃COOH
Answer: A

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

97. Which acid has lowest pH?
A) Strong acid
B) Weak acid
C) Neutral
D) Base
Answer: A

98. Which solution has pH greater than 7?
A) Acid
B) Base
C) Neutral
D) Salt
Answer: B

99. Which acid is used to manufacture fertilizers?
A) H₂SO₄
B) HCl
C) CH₃COOH
D) H₂CO₃
Answer: A

100. Which base is used to neutralize acidic soil?
A) Ca(OH)₂
B) HCl
C) HNO₃
D) CO₂
Answer: A