Free Printable Unit 2 AOS 1

1.

Which of the following is a strong acid?

a)

Hydrochloric acid (HCl)

b)

Acetic acid (CH₃COOH)

c)

Carbonic acid (H₂CO₃)

d)

Phosphoric acid (H₃PO₄)

2.

What is the pH of a neutral solution at 25°C?

a)

0

b)

7

c)

14

d)

1

3.

According to the Bronsted-Lowry theory, an acid is defined as:

a)

A substance that donates a proton (H⁺)

b)

A substance that accepts a proton (H⁺)

c)

A substance that donates an electron

d)

A substance that accepts an electron

4.

Identify the conjugate base of H₂SO₄.

a)

HSO₄⁻

b)

SO₄²⁻

c)

H₃SO₄⁺

d)

H₂SO₃

5.

Write the balanced equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH).

a)

$HCl + NaOH \rightarrow NaCl + H_2O$

b)

$HCl + NaOH \rightarrow Na + Cl + H_2O$

c)

$HCl + NaOH \rightarrow NaCl + H_2$

d)

$HCl + NaOH \rightarrow Na + Cl_2 + H_2O$

6.

Which of the following is a polyprotic acid?

a)

Hydrochloric acid (HCl)

b)

Sulfuric acid (H₂SO₄)

c)

Nitric acid (HNO₃)

d)

Hydrofluoric acid (HF)

7.

Which of the following pairs correctly represents a conjugate acid-base pair?

a)

HCl and Cl₂

b)

H₂O and OH⁻

c)

H₂SO₄ and SO₄²⁻

d)

NH₃ and NH₄⁺

8.

What is the general reaction between an acid and a base?

a)

Acid + Base → Salt + Water

b)

Acid + Base → Acid + Base

c)

Acid + Base → Salt + Hydrogen

d)

Acid + Base → Salt + Oxygen

9.

What is the product when an acid reacts with a metal?

a)

Salt and Water

b)

Salt and Hydrogen gas

c)

Salt and Oxygen gas

d)

Salt and Carbon dioxide

10.

Calculate the pH of a solution with a hydrogen ion concentration of $1 \times 10^{-3}$ M.

a)

3

b)

7

c)

10

d)

14

11.

Which of the following is a strong base?

a)

Ammonia (NH₃)

b)

Sodium hydroxide (NaOH)

c)

Calcium carbonate (CaCO₃)

d)

Acetic acid (CH₃COOH)

12.

What is the pH of a solution with a hydroxide ion concentration of $1 \times 10^{-4}$ M?

a)

4

b)

10

c)

7

d)

14

13.

According to the Bronsted-Lowry theory, a base is defined as:

a)

A substance that donates a proton (H⁺)

b)

A substance that accepts a proton (H⁺)

c)

A substance that donates an electron

d)

A substance that accepts an electron

14.

Identify the conjugate acid of NH₃.

a)

NH₂⁻

b)

NH₄⁺

c)

NH₃⁺

d)

NH₂⁺

15.

Which of the following acids is the weakest?

a)

Hydrochloric acid (HCl)

b)

Acetic acid (CH₃COOH)

c)

Sulfuric acid (H₂SO₄)

d)

Nitric acid (HNO₃)

Unit 2 AOS 1 - Acids (5)

Total questions: 15

Worksheet time: 8mins

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