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Online Chemistry MCQs with Answers

Chemistry MCQs play a crucial role in the initial tests for various branches of the Pakistan Army, Navy, and Air Force (PAF), including the Short Service Commission (SSC), Army Electrical and Mechanical Engineering (EME), Education Branch, Weapon Engineering Branch, PN Cadet, SSG, Sailors, and Navy Civilian jobs. The given online Chemistry MCQs are most helpful for the Sailors and Civilian, but overall for basics concepts of Commission tests also.

Over the years, candidates who have successfully cleared these tests have emphasized the importance of mastering chemistry MCQs to secure high marks. These MCQs are designed to test fundamental concepts in chemistry, such as atomic structure, chemical bonding, periodic table trends, acids and bases, and organic chemistry. By focusing on these areas, candidates can build a strong foundation and improve their chances of success.

Free Online Quiz of Chemistry MCQs

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Chemistry Tests Quiz (Matric Level)

1 / 25

Which gas protects the earth's surface from ultraviolet radiations:-

CO2

2 / 25

The vapour pressure of liquid increase with increase in of

Inter molecular force

temperature

pressure

polarity

3 / 25

All hydrogens (X2), Combine with hydrogen to give:

Hydrogen Halides

Hydrogen Chlorides

Hydrogen Bromides

Hydrogen Flouride

4 / 25

RNA role as

All of above

Synthesizer

Messenger

Transporter

5 / 25

The organic compounds used as drug to control bleeding are:-

vitamin

lipid

glycerides

Protein

6 / 25

The atomic mass of fluorine is:

7 / 25

Metals reacts with oxygen to form:-

carbon mono oxides

basic oxides

acidic oxides

amphoteric oxides

8 / 25

The bond formed due to mutual transfer of electrons is called:-

covalent

coordinate covalent

ionic

metallic

9 / 25

Who discovered the proton :

Neil Bohar

Rutherford

J.T.Thomsan

Goldstein

10 / 25

Which one of the following practical is most penetrating:

Neutron

Alpha particle

Electron

Proton

11 / 25

The excellent conductor of heat & electricity is:

12 / 25

Which one of the following is separated by physical means?

Compounds

Radicals

Mixture

Elements

13 / 25

Carbonates and bicarbonates react with dilute nitric acid to give:

Nitrogen and oxygen.

nitrogen peroxide and salt

a.carbon dioxide and salt

carbon and salt

14 / 25

The valency of phosphate radical is:

-3

-1

-2

-4

15 / 25

% by weight of chlorine in ocean is:

1.8

3.8

4.8

2.8

16 / 25

The meaning of Latin word Acidus is:-

sour

sweet

tasteless

salty

17 / 25

The boiling range of petroleum ether is_______ °C:-

30-80

80-170

20-170

170-250

18 / 25

Deficiency of vitamin D cause

Arthritis

Rickets

Kidney stone

Rabies

19 / 25

Who is the father of nuclear science?

J. J Thomson

Rutherford

Max Planck

Neil Bohr

20 / 25

The colour of Br is:

Greenish Yellow

Reddish Brown

Pale Yellow

Purple Black

21 / 25

The isotope use to generate electricity is:-

U-235

CO-60

P-32

C-12

22 / 25

Nitrogen and oxygen gases are being used to manufacture chemical since the advent of -----century:1

23 / 25

Reversible reaction :

Never complete

Non of these

Can complete

Both a and b

24 / 25

________ number of moles are equivalent to 8 grams of CO2:

0.15

0.24

0.21

0.18

25 / 25

Washing soda has water of crystallization has

Your score is

The average score is 37%

More Online Quiz of Chemistry MCQs

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More Important Chemistry MCQs Solved Past Experiences

1. Which of the following is the lightest element?

A) Hydrogen
B) Helium
C) Oxygen
D) Carbon
Answer: A) Hydrogen
Explanation: Hydrogen is the lightest element with an atomic mass of 1.

2. What is the chemical formula of water?

A) CO₂
B) H₂O
C) O₂
D) H₂
Answer: B) H₂O
Explanation: Water is composed of two hydrogen atoms and one oxygen atom.

3. Which gas is most abundant in the Earth’s atmosphere?

A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Argon
Answer: C) Nitrogen
Explanation: Nitrogen makes up about 78% of the Earth’s atmosphere.

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

A) 0
B) 7
C) 14
D) 10
Answer: B) 7
Explanation: A pH of 7 is considered neutral, as in pure water.

5. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Argon
D) Chlorine
Answer: C) Argon
Explanation: Argon is a noble gas, which is inert and does not react easily with other elements.

6. What is the atomic number of carbon?

A) 6
B) 12
C) 14
D) 8
Answer: A) 6
Explanation: Carbon has 6 protons, so its atomic number is 6.

7. Which of the following is a strong acid?

A) Acetic acid
B) Hydrochloric acid
C) Citric acid
D) Carbonic acid
Answer: B) Hydrochloric acid
Explanation: Hydrochloric acid (HCl) is a strong acid that completely dissociates in water.

8. What is the chemical formula of table salt?

A) NaCl
B) KCl
C) CaCl₂
D) MgCl₂
Answer: A) NaCl
Explanation: Table salt is sodium chloride (NaCl).

9. Which element is essential for combustion?

A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Hydrogen
Answer: B) Oxygen
Explanation: Oxygen supports combustion, allowing substances to burn.

10. What is the main component of natural gas?

A) Methane
B) Ethane
C) Propane
D) Butane
Answer: A) Methane
Explanation: Natural gas primarily consists of methane (CH₄).

11. Which of the following is a greenhouse gas?

A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon
Answer: C) Carbon dioxide
Explanation: Carbon dioxide traps heat in the atmosphere, contributing to the greenhouse effect.

12. What is the chemical symbol for gold?

A) Ag
B) Au
C) Fe
D) Cu
Answer: B) Au
Explanation: The chemical symbol for gold is Au, derived from its Latin name “Aurum.”

13. Which of the following is a non-metal?

A) Iron
B) Sodium
C) Sulfur
D) Calcium
Answer: C) Sulfur
Explanation: Sulfur is a non-metal, while the others are metals.

14. What is the formula for sulfuric acid?

A) H₂SO₄
B) HCl
C) HNO₃
D) H₃PO₄
Answer: A) H₂SO₄
Explanation: Sulfuric acid is a strong acid with the formula H₂SO₄.

15. Which gas is used in balloons to make them float?

A) Oxygen
B) Hydrogen
C) Helium
D) Nitrogen
Answer: C) Helium
Explanation: Helium is lighter than air, making it ideal for filling balloons.

16. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

17. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Magnesium
Answer: B) Chlorine
Explanation: Chlorine is a halogen, found in Group 17 of the periodic table.

18. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

19. Which of the following is a strong base?

A) Sodium hydroxide
B) Ammonia
C) Water
D) Acetic acid
Answer: A) Sodium hydroxide
Explanation: Sodium hydroxide (NaOH) is a strong base that dissociates completely in water.

20. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

21. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

22. What is the chemical formula of carbon dioxide?

A) CO
B) CO₂
C) C₂O
D) C₂O₂
Answer: B) CO₂
Explanation: Carbon dioxide consists of one carbon atom and two oxygen atoms.

23. Which of the following is a transition metal?

A) Sodium
B) Iron
C) Calcium
D) Aluminum
Answer: B) Iron
Explanation: Iron is a transition metal, found in the d-block of the periodic table.

24. What is the chemical formula of ozone?

A) O₂
B) O₃
C) O₄
D) O
Answer: B) O₃
Explanation: Ozone is a molecule composed of three oxygen atoms.

25. Which of the following is a property of acids?

A) Turn blue litmus red
B) Turn red litmus blue
C) Have a pH greater than 7
D) Are slippery to touch
Answer: A) Turn blue litmus red
Explanation: Acids turn blue litmus paper red and have a pH less than 7.

More Past Experiences of Chemistry MCQs with Answers

26. What is the chemical formula of common salt?

A) NaCl
B) KCl
C) CaCl₂
D) MgCl₂
Answer: A) NaCl
Explanation: Common salt is sodium chloride (NaCl).

27. Which of the following is a property of bases?

A) Sour taste
B) Turn red litmus blue
C) Have a pH less than 7
D) React with metals to produce hydrogen gas
Answer: B) Turn red litmus blue
Explanation: Bases turn red litmus paper blue and have a pH greater than 7.

28. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

29. Which of the following is a strong acid?

A) Acetic acid
B) Hydrochloric acid
C) Citric acid
D) Carbonic acid
Answer: B) Hydrochloric acid
Explanation: Hydrochloric acid (HCl) is a strong acid that completely dissociates in water.

30. What is the chemical formula of sulfuric acid?

A) H₂SO₄
B) HCl
C) HNO₃
D) H₃PO₄
Answer: A) H₂SO₄
Explanation: Sulfuric acid is a strong acid with the formula H₂SO₄.

31. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Argon
D) Chlorine
Answer: C) Argon
Explanation: Argon is a noble gas, which is inert and does not react easily with other elements.

32. What is the chemical formula of carbon dioxide?

A) CO
B) CO₂
C) C₂O
D) C₂O₂
Answer: B) CO₂
Explanation: Carbon dioxide consists of one carbon atom and two oxygen atoms.

33. Which of the following is a transition metal?

A) Sodium
B) Iron
C) Calcium
D) Aluminum
Answer: B) Iron
Explanation: Iron is a transition metal, found in the d-block of the periodic table.

34. What is the chemical formula of ozone?

A) O₂
B) O₃
C) O₄
D) O
Answer: B) O₃
Explanation: Ozone is a molecule composed of three oxygen atoms.

35. Which of the following is a property of acids?

A) Turn blue litmus red
B) Turn red litmus blue
C) Have a pH greater than 7
D) Are slippery to touch
Answer: A) Turn blue litmus red
Explanation: Acids turn blue litmus paper red and have a pH less than 7.

36. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

37. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

38. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

39. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Magnesium
Answer: B) Chlorine
Explanation: Chlorine is a halogen, found in Group 17 of the periodic table.

40. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

41. Which of the following is a strong base?

A) Sodium hydroxide
B) Ammonia
C) Water
D) Acetic acid
Answer: A) Sodium hydroxide
Explanation: Sodium hydroxide (NaOH) is a strong base that dissociates completely in water.

42. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

43. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

44. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

45. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Magnesium
Answer: B) Chlorine
Explanation: Chlorine is a halogen, found in Group 17 of the periodic table.

46. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

47. Which of the following is a strong base?

A) Sodium hydroxide
B) Ammonia
C) Water
D) Acetic acid
Answer: A) Sodium hydroxide
Explanation: Sodium hydroxide (NaOH) is a strong base that dissociates completely in water.

48. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

49. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

50. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

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