Acids and Bases Quiz

According to Arrhenius concept, a base is a substance that:

• Donates a proton

• Accepts a proton

• Increases OH⁻ concentration in water

• Increases H⁺ concentration in water

Which of the following is a Brønsted-Lowry acid?

• NH₃

• OH⁻

• HCl

• CH₄

Which of the following is a Lewis acid?

• NH₃

• OH⁻

• BF₃

• CH₄

In the reaction NH₃ + H₂O → NH₄⁺ + OH⁻, NH₃ acts as a:

• Brønsted-Lowry base

• Brønsted-Lowry acid

• Lewis acid

• None of the above

Which of the following statements is TRUE?

• All Arrhenius acids are Brønsted acids

• All Brønsted acids are Lewis acids

• All Lewis acids are Arrhenius acids

• All Brønsted bases are Arrhenius bases

Which of the following is a strong acid?

• CH₃COOH

• HF

• H₂CO₃

• HNO₃

Which of the following factors affects acid strength?

• Electronegativity

• Atomic size

• Inductive effect

• All of the above

Which of the following is the correct expression for Ka?

• Ka=[HA][H+][A−]\ Ka = \frac{[HA]}{[H⁺][A⁻]}

• Ka=[H+][A−][HA]\ Ka = \frac{[H⁺][A⁻]}{[HA]}

• Ka=[A−][H+][HA]\ Ka = \frac{[A⁻]}{[H⁺][HA]}

• Ka=[H+][A−]\ Ka = [H⁺] [A⁻]

Which acid has the highest Ka value?

• CH₃COOH

• HNO₃

• HF

• H₂CO₃

A base with a high Kb value is considered:

• Weak

• Strong

• Neutral

• Amphoteric