APCE Acids & Bases

Question 1

What defines an acid according to the Brønsted-Lowry theory?

Accepted Answer

An acid donates a proton.

Answer

An acid accepts a proton.

Answer

An acid accepts an electron.

Answer

An acid donates an electron.

Question 2

What is the pH of a neutral solution?

Accepted Answer

7.

Answer

0.

Answer

14.

Answer

3.

Question 3

What is the relationship between pH and hydrogen ion concentration?

Accepted Answer

As the concentration of H⁺ increases, pH decreases.

Answer

As the concentration of H⁺ increases, pH increases.

Answer

As the concentration of H⁺ increases, pH remains the same.

Answer

As the concentration of H⁺ increases, pH increases slowly.

Question 4

Which of the following is a strong acid?

Accepted Answer

HCl (Hydrochloric acid).

Answer

HF (Hydrofluoric acid).

Answer

CH₃COOH (Acetic acid).

Answer

H₂CO₃ (Carbonic acid).

Question 5

What is the conjugate base of HCl?

Accepted Answer

Cl⁻.

Answer

H₂O.

Answer

H₃O⁺.

Answer

HCl₂.

Question 6

What is a buffer solution?

Accepted Answer

A solution that resists changes in pH when acid or base is added.

Answer

A solution that completely dissociates in water.

Answer

A solution with a very high pH.

Answer

A solution that contains only acids.

Question 7

What is the conjugate acid of NH₃?

Accepted Answer

NH₄⁺.

Answer

NH₂⁻.

Answer

NH₃.

Answer

OH⁻.

Question 8

What is the pH of a 0.001 M NaOH solution?

Accepted Answer

11.

Answer

4.

Answer

7.

Answer

1.

Question 9

What is the primary difference between strong and weak acids?

Accepted Answer

Strong acids dissociate completely, while weak acids only partially dissociate.

Answer

Strong acids have a higher pH.

Answer

Weak acids are always stronger than strong acids.

Answer

There is no difference.