Which of the following is a strong acid?
a) Hydrochloric acid (HCl)
b) Acetic acid (CH₃COOH)
c) Carbonic acid (H₂CO₃)
d) Phosphoric acid (H₃PO₄)
Answer: a

What is the pH of a neutral solution at 25°C?
a) 0
b) 7
c) 14
d) 1
Answer: b

Which of the following is an example of a weak base?
a) Sodium hydroxide (NaOH)
b) Ammonia (NH₃)
c) Potassium hydroxide (KOH)
d) Calcium hydroxide (Ca(OH)₂)
Answer: b

What is the product of the reaction between an acid and a base?
a) Salt and water
b) Acid and water
c) Base and water
d) Salt and hydrogen gas
Answer: a

Which ion is characteristic of all acids in aqueous solutions?
a) OH−OH^-OH−
b) H+H^+H+
c) Na+Na^+Na+
d) Cl−Cl^-Cl−
Answer: b

Litmus paper turns red in the presence of:
a) Acids
b) Bases
c) Salts
d) Neutral solutions
Answer: a

What is the pH of a solution with a hydrogen ion concentration of 1×10−31 \times 10^{-3}1×10−3 M?
a) 3
b) 7
c) 10
d) 14
Answer: a

Which of the following is a characteristic property of bases?
a) Sour taste
b) Slippery feel
c) Red color on litmus paper
d) Reacts with metals to produce hydrogen gas
Answer: b

Which of the following is a common household base?
a) Vinegar
b) Baking soda
c) Lemon juice
d) Salt
Answer: b

A solution with a pH of 2 is:
a) Strongly acidic
b) Weakly acidic
c) Neutral
d) Strongly basic
Answer: a