Chemistry MCQ Quiz – 20 Important Multiple Choice Questions with Instant Answers

Test your chemistry knowledge with this interactive set of 20 Important Chemistry MCQs. Click an option to see the correct answer instantly.

1. What is the atomic number of Oxygen?

A) 6

B) 8

C) 10

D) 12

2. What is the pH value of pure water?

A) 5

B) 6

C) 7

D) 8

3. Which bond involves transfer of electrons?

A) Ionic Bond

B) Covalent Bond

C) Metallic Bond

D) Hydrogen Bond

4. Which element is a noble gas?

A) Oxygen

B) Neon

C) Hydrogen

D) Chlorine

5. Which acid is present in vinegar?

A) Acetic Acid

B) Citric Acid

C) Hydrochloric Acid

D) Sulfuric Acid

6. What is the chemical symbol of Sodium?

A) Na

B) So

C) S

D) Sn

7. Which particle has no charge?

A) Proton

B) Neutron

C) Electron

D) Ion

8. What is the SI unit of temperature?

A) Celsius

B) Kelvin

C) Fahrenheit

D) Joule

9. Which metal is liquid at room temperature?

A) Mercury

B) Iron

C) Copper

D) Gold

10. What is HCl commonly known as?

A) Hydrochloric Acid

B) Nitric Acid

C) Sulfuric Acid

D) Acetic Acid

11. Which compound is baking soda?

A) NaHCO3

B) NaCl

C) CaCO3

D) KCl

12. Which gas turns lime water milky?

A) Oxygen

B) Carbon Dioxide

C) Nitrogen

D) Hydrogen

13. What is the chemical symbol of Gold?

A) Au

B) Ag

C) Go

D) Gd

14. Which element is the lightest?

A) Hydrogen

B) Oxygen

C) Nitrogen

D) Helium

15. What type of reaction is burning?

A) Combustion

B) Decomposition

C) Neutralization

D) Displacement

16. What is the atomic number of Hydrogen?

A) 1

B) 2

C) 3

D) 4

17. Which gas is essential for respiration?

A) Nitrogen

B) Oxygen

C) Carbon Dioxide

D) Helium

18. What is the formula of common salt?

A) NaCl

B) KCl

C) Na2Cl

D) CaCl2

19. Which instrument measures atmospheric pressure?

A) Thermometer

B) Barometer

C) Hygrometer

D) pH Meter

20. Which element is represented by the symbol Fe?

A) Iron

B) Fluorine

C) Francium

D) Zinc