Hydrogen ion Concentration pH Scale and Buffer solution Quiz Online Practice Test

1. What is the full range of the pH scale?

7 to 10

0 to 10

0 to 14

7 to 14

2. What is the typical pH level of an antacid solution?

≤ 6.5

≥ 7.0

3. Given three solutions with pH values of 6, 8, and 9.5, which one has the highest concentration of OH⁻ ions?

Solution sample 1

Solution sample 2

Solution sample 3

Data are insufficient

4. What is the pH value of a solution containing a neutral salt?

5. How is ammonium sulphate classified in terms of its acidic or basic nature?

Basic salt

Acidic salt

Neutral salt

Complex salt

6. What gas is produced when sulfuric acid reacts with an eggshell?

Hydrogen gas

Nitrogen gas

Carbon monoxide

Carbon dioxide gas

7. What are the byproduct gases produced in the Chlor-alkali process?

Hydrogen only

Hydrogen and oxygen gas

Hydrogen and chlorine gas

Chlorine and nitrogen gas

8. Which of the following salts does not exhibit hygroscopic properties?

NaCl

MgCl₂

CaCl₂

KCl

9. As water is progressively diluted with acids, how does the concentration of H⁺ ions change?

Increase

Decrease

Remain the same

Depend on the type of acid

10. What is the typical product when acids react with metal oxides?

Water and salt

Salts and hydrogen gas

Salts only

No reaction occurs

11. Calculate the pH of a solution obtained by combining equal volumes of 0.1 M NaOH and 0.01 M HCl.

7.0

2.0

12.65

1.04

12. Determine the solubility product (Ksp) of Ba(OH)₂ given that the pH of its saturated solution is 12.

5.0 × 10⁻⁷

3.3 × 10⁻⁷

5.0 × 10⁻⁶

4.0 × 10⁻⁶

13. Buffer solutions are known for their ability to resist changes in pH. This property is due to:

Acids and alkalis in the solution being shielded from interference by other ions

The presence of unionized acid or base that reacts with added acids or alkalis

A fixed pH value

A large excess of H⁺ or OH⁻ ions

14. Which of the following combinations will form a buffer solution?

HNO₂ and NaNO₂

HCl and KCl

HNO₃ and NH₄NO₃

NaOH and NaCl

15. Which of the following ions is the strongest conjugate base?

Cl⁻

SO₄²⁻

CH₃COO⁻

NO₃⁻

16. What is the pH of a 0.1 N NaOH solution?

17. What is the conjugate acid of NH₂⁻?

NH₄⁺

NH₄OH

NH₃

NH₂⁻

18. If you mix 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)₂, what will be the resulting concentration of [OH⁻] in the solution?

0.0050 M

0.40 M

0.10 M

0.12 M

19. Among the following equimolar solutions, which one will have the highest pH?

AlCl₃

BaCl₂

BeCl₂

LiCl

20. Which of the following pairs does not form an acidic buffer?

H₂CO₃ and Na₂CO₃

CH₃COOH and CH₃COONa

HClO₄ and NaClO₄

H₃PO₄ and Na₃PO₄

Test Name:	Hydrogen ion Concentration pH Scale and Buffer solution Quiz
Subject Category:	Chemistry
Test Type:	Multiple Choice Questions
Total Score / Questions:	20 / 20
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

Hydrogen ion Concentration pH Scale and Buffer solution MCQ Quiz Online Practice Test